Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued capital costs	$ 110,313	$ 361,034
Accrued lease operating expenses	18,448	26,706
Accrued general and administrative expenses	18,404	12,225
Accrued well services and midstream operating expenses	13,517	4,845
Other accrued liabilities	6,987	5,569
Total accrued liabilities	$ 167,669	$ 410,379