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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Statutory U.S. federal rate 21.00% 35.00% 35.00%  
Operating loss carryforwards, valuation allowance $ 19,100 $ 68,600    
Unrecognized tax benefits 52,159 131,608 $ 152,581 $ 47,109
Unrecognized tax benefits recognition impact on effective tax rate 47,200      
Interest on income taxes accrued net of related benefit 13,600 21,200 20,200  
Interest on income tax expense net of related tax benefit (7,300) $ 2,700 $ 5,100  
Decrease in Unrecognized Tax Benefits is Reasonably Possible $ 6,200      
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