Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Statutory U.S. federal rate	35.00%	35.00%	35.00%
Operating loss carryforwards, valuation allowance	$ 83,700,000
Unrecognized tax benefits	47,109,300	$ 59,404,900	$ 7,343,500	$ 3,951,100
Unrecognized tax benefits recognition impact on effective tax rate	25,200,000
Interest on income taxes accrued net of related benefit	7,000,000	5,900,000
Interest on income tax expense net of related tax benefit	1,400,000	$ 2,300,000	$ 100,000
State and Local Jurisdiction
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards	$ 26,000,000
Minimum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Combination of subsidiaries (in years)	3 years
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Combination of subsidiaries (in years)	4 years