Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 88,400	$ 83,700
Unrecognized tax benefits	152,581	47,109	$ 59,405	$ 7,344
Unrecognized tax benefits recognition impact on effective tax rate	120,000
Interest on income taxes accrued net of related benefit	20,200	7,000	5,900
Interest on income tax expense net of related tax benefit	5,100	$ 1,400	$ 2,300
State and Local Jurisdiction
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards	$ 12,900
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