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Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Beginning balance $ 284,108 $ 235,705
Increases related to tax positions taken during prior years 25,654 12,051
Decreases related to settlement agreements (19,871) 0
Decreases related to expiration of statute of limitations (5,356) 0
Increases related to tax positions taken during the current year 22,142 36,352
Ending balance $ 306,677 $ 284,108