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Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |
Beginning balance, as of January 1 | $ 43,395 | $ 36,263 | $ 38,958
Tax positions for current year, Additions | 1,322 | 4,716 | 8,208
Tax positions for prior years, Additions | 8,043 | 2,626 | 199
Tax positions for prior years, Reductions | (31,397) | (153) | (10,573)
Expiration of statutes, Reductions | (183) | (57) | (325)
Settlements with tax authorities, Reductions |  |  | (204)
Ending balance as of December 31 | $ 21,180 | $ 43,395 | $ 36,263

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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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