Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Additional Information (Detail)

v3.6.0.2
Acquisitions and Divestitures - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Oct. 31, 2015
Sep. 30, 2015
Aug. 31, 2015
May 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Sep. 12, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Significant Acquisitions and Disposals                        
Loss (gain) on sales of assets, net               $ 49 $ (1,261)   $ (41,335) $ (120,769)
Eagle Ford Shale, Lavaca County [Member]                        
Significant Acquisitions and Disposals                        
Proceeds from Sale of Oil and Gas Property and Equipment $ 12,500                      
Gain on sale of oil and gas property                   $ 9,500    
Granite Wash [Member]                        
Significant Acquisitions and Disposals                        
Proceeds from Sale of Oil and Gas Property and Equipment $ 100                      
East Texas [Member]                        
Significant Acquisitions and Disposals                        
Proceeds from Sale of Oil and Gas Property and Equipment     $ 73,000                  
Gain on sale of oil and gas property       $ 43,000                
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment       29,500                
Disposal Group, Including Discontinued Operation, Assets       33,300                
Disposal Group, Including Discontinued Operation, Asset Retirement Obligation       $ 3,800                
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax                   1,300 (27,500)  
South Texas Oil Gathering Sys. Development Rights                        
Significant Acquisitions and Disposals                        
Proceeds from Sale of Intangible Assets         $ 147,100              
Gain (Loss) on Disposition of Assets         147,100              
Sale Leaseback Transaction, Recognized Gain, Net         63,000              
Amount of the deferred gain recognized in the current period   $ 8,400             1,700 74,100    
Sale Leaseback Transaction, Deferred Gain, Gross                     84,100  
Selma Chalk, MS Assets                        
Significant Acquisitions and Disposals                        
Proceeds from Sale of Oil and Gas Property and Equipment         $ 67,900              
Impairment of property           $ 117,900           $ 117,900
South Texas Natural Gas Gathering Assets                        
Significant Acquisitions and Disposals                        
Sale Leaseback Transaction, Recognized Gain, Net             $ 56,700          
Amount of the deferred gain recognized in the current period                   400 400  
Proceeds from Sale of Oil and Gas Property and Equipment             96,000          
Loss (gain) on sales of assets, net             $ (67,300)   $ (300) $ (9,500)    
Non-core assets                        
Significant Acquisitions and Disposals                        
Proceeds from Sale of Oil and Gas Property and Equipment                     2,900  
Loss (gain) on sales of assets, net                     $ (200)