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Income Taxes - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning Balance $ 35,643 $ 35,500 $ 33,220
Increases related to current and prior year tax positions 160 204 2,653
Settlements and lapses in statutes of limitations   (61) (373)
Ending Balance $ 35,803 $ 35,643 $ 35,500