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Income Taxes - Balances of Unrecognized Tax Benefits (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Unrecognized tax benefits $ 54,541,000 $ 50,668,000 $ 48,306,000 $ 50,555,000
Portion that, if recognized, would reduce tax expense and effective tax rate 48,312,000 42,952,000 40,029,000  
Accrued interest on unrecognized tax benefits 8,750,000 6,304,000 5,766,000  
Accrued penalties on unrecognized tax benefits 673,000 697,000 99,000  
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 24,009,000 8,484,000 4,816,000  
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 $ 27,485,000 $ 10,221,000 $ 6,554,000