Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Taxes [Line Items]
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Income tax (benefit) expense	$ (129,488,000)	$ (61,975,000)	$ (173,526,000)	$ (39,609,000)
Equity Compensation
Income Taxes [Line Items]
Income tax (benefit) expense			3,700,000
Deferred compensation plan
Income Taxes [Line Items]
Income tax (benefit) expense	2,600,000	1,100,000	2,500,000	(874,000)
Valuation Allowance, Operating Loss Carryforwards | State
Income Taxes [Line Items]
Income tax (benefit) expense	$ 3,200,000	$ 6,100,000	$ 7,700,000	$ 11,300,000