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Income Taxes - Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 | $ 50,920 | $ 48,605 | $ 48,845
Additions based on tax positions related to current year | 4,138 | 9,272 | 16,424
Reductions based on tax positions related to current year | 0 | 0 | 0
Additions based on tax positions related to prior years | 223 | 2,106 | 199
Reductions based on tax positions related to prior years |  | (2,863) | (8,198)
Reductions due to settlements with taxing authorities |  | (1,514) | (2,160)
Reductions due to statute of limitations lapse | (7,316) | (4,686) | (6,505)
Balance at end of year | $ 47,965 | $ 50,920 | $ 48,605

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- Definition Unrecognized tax benefits increases decreases resulting from settlements with taxing authorities. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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