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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) Tax_Positions | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Tax Contingency [Line Items] |  |  |
Statutory tax rate, percentage | 21.00% |  |
Deferred tax assets, liability |  | $ 1,900,000 |
Valuation allowance | $ 3,015,000 | 3,096,000 |
Income tax expense (benefit) | $ 42,289,000 | 46,791,000 | $ 34,983,000
Unrecognized tax benefits number of tax matters | Tax_Positions | 0 |  |
Unrecognized tax benefits related to identified uncertain tax positions | $ 0 |  |
Tax years subject to examination | 2015 2016 2017 2018 |  |
Accounting Standards Update 2016-09 [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax expense (benefit) | $ 2,400,000 | $ 1,500,000 |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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