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Income Tax - Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Uncertainties [Abstract]      
Balance, beginning of year $ 19,859 $ 20,616 $ 20,112
Gross increases-tax positions in prior period 53   2,323
Gross decreases-tax positions in prior period   (757) (1,889)
Gross increases-tax positions in current period     916
Lapse of statute of limitations (7,065)   (846)
Balance, end of year $ 12,847 $ 19,859 $ 20,616