Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Additional Information (Detail)

v3.10.0.1
Acquisitions and Divestitures - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Mar. 01, 2018
USD ($)
Jul. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Feb. 28, 2018
USD ($)
Nov. 01, 2017
USD ($)
Sep. 29, 2017
USD ($)
a
Dec. 31, 2016
USD ($)
Sep. 12, 2016
USD ($)
Significant Acquisitions and Disposals                              
Capitalized Costs, Proved Properties           $ 2,400     $ 3,700 $ 2,400          
Escrow Amount Transferred                         $ 7,100    
Second Lien Facility           200,000     200,000 200,000          
Escrow Deposit Remaining           3,210 [1]     0 3,210 [1]          
Property, Plant and Equipment, Gross           590,375     1,121,860 590,375          
Asset Retirement Obligation           3,286     4,314 3,286       $ 2,459 $ 2,700
Cash Received for Suspended Revenues Attributable to Acquired Properties   $ 355                          
Mid-Continent Divestiture [Member]                              
Significant Acquisitions and Disposals                              
Proceeds from Sale of Oil and Gas Property and Equipment $ 6,200               6,000            
Cash Paid to Buyer in Connection with Final Settlement                 500            
Cash Paid for Suspended Revenues in Connection with FInal Settlement                 200            
Asset Retirement Obligation                 300            
Working Capital Adjustments, Net 1,300   $ 1,300                        
Pre-Tax Operating Income Attributable to Assets Sold         $ (1,600)   $ (2,200)                
Undeveloped Acreage [Member]                              
Significant Acquisitions and Disposals                              
Proceeds from Sale of Oil and Gas Property and Equipment                 1,700            
Hunt Acquisition [Domain]                              
Significant Acquisitions and Disposals                              
Other Payments to Acquire Businesses                 86,000            
Hunt Acquisition [Member]                              
Significant Acquisitions and Disposals                              
Capitalized Costs, Proved Properties   82,443                          
Cash Paid on Date of Acquisition   84,400                          
Accumulated Costs, net of suspended revenues, for wells in which Hunt elected not to participate   13,778                          
Business Acquisition, Transaction Costs   96,978   $ 400   100     500 100          
Capitalized Costs, Proved Properties   16,339                          
Asset Retirement Obligation   356                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   96,978                          
Working Capital Adjustments, Net $ (245)   (245)                        
Cash Received for Suspended Revenues Attributable to Acquired Properties     $ 1,448                        
Net Cash Paid on Date of Acquisition   82,955                          
Devon Acquisition [Member]                              
Significant Acquisitions and Disposals                              
Business Acquisition, Revenue Reported by Acquired Entity since Acquisition Date       0   9,000                  
Business Acquisition, Pro Forma Revenue                 446,077 209,015          
Capitalized Costs, Proved Properties   42,866                          
Acreage, Net | a                         19,600    
Other Payments to Acquire Businesses                 205,000            
Escrow Deposit                         $ 10,300    
Cash Paid on Date of Acquisition   190,277                     $ 189,900    
Additional working interests                       $ 700      
Amount Transferred from Escrow Account   9,519                 $ 2,500        
Business Acquisition, Transaction Costs                 1,300            
Escrow Deposit Remaining           3,200       3,200          
Capitalized Costs, Proved Properties   146,686                          
Property, Plant and Equipment, Gross   8,642                          
Asset Retirement Obligation   494                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   197,345                          
Working Capital Adjustments, Net   (2,451)                          
Preliminary Purchase Price   $ 197,345                          
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax                 $ 227,930 $ 30,861          
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares                 $ 15.14 $ 0          
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares                 $ 14.91 $ 0          
Escrow Distributed                     $ 700        
Cash Received for Suspended Revenues Attributable to Acquired Properties               $ 400              
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual       $ 0   $ 4,000                  
[1] 1 The December 31, 2017 amount represents amounts that had remained in the Escrow Account for the Devon Acquisition which fully funded the remaining liability due to Devon for the final settlement (see Note 5).