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Income Taxes - Schedule of Activity Related to Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of year | $ 10,972 | $ 9,469 | $ 18,447
Increases related to prior year tax positions | 385 | 2,284 | 301
Decreases related to prior year tax positions |  | (143) | (3,927)
Increases related to current year tax positions | 2,900 | 1,430 | 2,258
Settlements |  |  | (5,644)
Decreases related to lapse of statutes of limitation | (3,072) | (2,068) | (1,966)
Balance at end of year | $ 11,185 | $ 10,972 | $ 9,469

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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=84176650&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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