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Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Beginning balance $ 342,904 $ 306,677
Increases related to tax positions taken during prior years 745 46,520
Decreases related to expiration of statute of limitations   (41,022)
Increases related to tax positions taken during the current year 31,514 30,729
Ending balance $ 375,163 $ 342,904