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Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Beginning balance $ 306,677 $ 284,108
Increases related to tax positions taken during prior years 46,520 25,654
Decreases related to settlement agreements   (19,871)
Decreases related to expiration of statute of limitations (41,022) (5,356)
Increases related to tax positions taken during the current year 30,729 22,142
Ending balance $ 342,904 $ 306,677