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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 173,726 $ 150,930 $ 82,390
Gross increases related to prior year tax positions 14,732 0 33,436
Gross decreases related to prior year tax positions 0 (1,160) 0
Gross increases related to current year tax positions 29,149 31,332 48,685
Decreases resulting from expiration of statute of limitation (6,518) (2,112) (1,276)
Decreases resulting from settlements (3,330) (5,264) (12,305)
Ending balance $ 207,759 $ 173,726 $ 150,930