Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes [Line Items]
Federal statutory rate	35.00%	35.00%
Income tax (benefit) expense	$ (44,038,000)	$ 22,366,000
Equity Compensation [Member]
Income Taxes [Line Items]
Income tax (benefit) expense	3,600,000
Deferred compensation plan
Income Taxes [Line Items]
Income tax (benefit) expense	(96,000)	(2,000,000)
Valuation Allowance, Operating Loss Carryforwards | State
Income Taxes [Line Items]
Income tax (benefit) expense	$ 4,500,000	$ 5,100,000