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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties [1] $ 5,589,637 $ 5,156,875
Less: Accumulated depreciation, depletion, amortization and impairment (1,273,361) (1,043,121)
Proved oil and gas properties, net 4,316,276 4,113,754
Unproved oil and gas properties 689,089 809,265
Total oil and gas properties, net 5,005,365 4,923,019
Other property and equipment 416,417 313,439
Less: Accumulated depreciation (65,125) (49,672)
Other property and equipment, net 351,292 263,767
Total property, plant and equipment, net 5,356,657 5,186,786
Asset retirement costs $ 38,200 $ 36,900
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $38.2 million and $36.9 million at June 30, 2015 and December 31, 2014, respectively.