Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Reconciliation [Line Items]
Estimated effective income tax rate	55.00%	29.00%	37.00%
Effective tax rate impacted by net tax benefit	$ 0	$ 15,505,000	$ 0
Recognized tax benefit from uncertain tax positions	31,000,000
Increase (reduction) in the available loss deduction	(15,500,000)
Valuation allowance for deferred tax assets	10,855,000	2,397,000
Deferred tax assets related to net operating losses for federal income tax purposes	$ 20,591,000	21,547,000
Ownership percentage	50.00%
Percentage increasing ownership	5.00%
Pre-tax net operating loss carryovers	$ 62,300,000
Built-in losses annual limitation	4,200,000
Interest or penalties related to uncertain tax positions	0	0	0
Income tax expense (benefit)	36,972,000	$ 39,349,000	$ 44,778,000
Stock-based incentive plans [Member]
Income Tax Reconciliation [Line Items]
Income tax expense (benefit)	(1,100,000)
Federal [Member]
Income Tax Reconciliation [Line Items]
Deferred tax assets related to net operating losses for federal income tax purposes	40,300,000
State [Member]
Income Tax Reconciliation [Line Items]
Deferred tax assets related to net operating losses for federal income tax purposes	$ 6,500,000