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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Details) - 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]      
Balance at beginning of year $ 64,645 $ 70,327 $ 74,388
Additions for tax positions taken in the current year 3,090 5,149 4,450
Additions for tax positions of prior years 7,504 12,679 2,612
Additions for tax positions from acquisitions 0 1,294 0
Reductions for tax positions of prior years 0 (19,611) (5,831)
Reductions for tax positions of expired statute of limitations (656) (1,192) (3,143)
Settlements (1,529) (4,001) (2,149)
Balance at end of year $ 73,054 $ 64,645 $ 70,327