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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance of unrecognized tax benefits at beginning of year | $ 50,953 | $ 38,162 | $ 26,428
Gross amount of increases in unrecognized tax benefits as a result of positions taken during a prior year | 20,361 | 9,751 | 1,169
Gross amount of decreases in unrecognized tax benefits as a result of positions taken during a prior year | (2,241) | (5,362) | (268)
Gross amount of increases in unrecognized tax benefits as a result of positions taken during the current year | 13,274 | 14,677 | 13,191
The amounts of decreases in unrecognized benefits relating to settlements with taxing authorities | (3,575) | (4,550) | 0
Reduction in unrecognized tax benefits due to the lapse of applicable statute of limitation | (3,973) | (1,725) | (2,358)
Balance of unrecognized tax benefits at end of year | $ 74,799 | $ 50,953 | $ 38,162

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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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- 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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