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Reconciliation of Beginning and Ending Liability for Unrecognized Tax Benefits that Do Not Meet More-Likely-than-not Threshold (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Beginning balance $ 39,011 $ 31,877
Additions for tax positions related to current year 9,714 6,131
Additions for tax positions related to prior years   2,999
Reductions related to lapse of applicable statute (1,277) (1,996)
Reductions related to settlements with taxing authorities (23,382)  
Ending balance $ 24,066 $ 39,011