Accrued Liabilities and Other - Schedule of Accrued Liabilities and Other (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities and Other Liabilities [Abstract]
Prepaid advances from joint interest owners	$ 57,196	$ 30,434
Accrued compensation	41,757	27,797
Accrued production taxes, ad valorem taxes and other non-income taxes	35,900	33,466
Accrued income taxes	0	10,455
Accrued interest	61,216	46,973
Current portion of asset retirement obligations	1,434	2,227	2,287
Other	610	4,329
Accrued liabilities and other	$ 198,113	$ 155,681