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Income Taxes - Balances of Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]        
Unrecognized tax benefits $ 48,838 $ 51,244 $ 47,379 $ 50,632
Portion that, if recognized, would reduce tax expense and effective tax rate 40,562 43,910 39,824  
Accrued interest on unrecognized tax benefits 5,837 6,088 7,180  
Accrued penalties on unrecognized tax benefits 99 127 163  
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months lower bound 0 0 0  
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months upper bound 6,722 11,479 12,110  
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 $ 4,984 $ 9,645 $ 10,221