Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.6.0.2
Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
Boe
Property, Plant and Equipment [Line Items]  
Barrel of liquids equivalents of natural gas 0.006
Oil And Gas Unproved Properties  
Property, Plant and Equipment [Line Items]  
Useful lives over the lesser of five years or the average remaining lease term
Useful life 5 years
Minimum | Gathering systems  
Property, Plant and Equipment [Line Items]  
Useful life 15 years
Minimum | Other property and equipment  
Property, Plant and Equipment [Line Items]  
Useful life 3 years
Maximum  
Property, Plant and Equipment [Line Items]  
Revenue collection period 60 days
Maximum | Gathering systems  
Property, Plant and Equipment [Line Items]  
Useful life 20 years
Maximum | Other property and equipment  
Property, Plant and Equipment [Line Items]  
Useful life 20 years