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Income Taxes - Balances of Unrecognized Tax Benefits (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Unrecognized tax benefits $ 35,240,000 $ 54,541,000 $ 50,668,000 $ 48,306,000
Portion that, if recognized, would reduce tax expense and effective tax rate 33,128,000 48,312,000 42,952,000  
Accrued interest on unrecognized tax benefits 5,539,000 8,750,000 6,304,000  
Accrued penalties on unrecognized tax benefits 650,000 673,000 697,000  
Portion that, if recognized, would reduce tax expense and effective tax rate lower bound 0 0 0  
Portion that, if recognized, would reduce tax expense and effective tax rate upper bound 10,983,000 24,009,000 8,484,000  
Minimum [Member]        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months 0 0 0  
Maximum [Member]        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months $ 12,332,000 $ 27,485,000 $ 10,221,000