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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision | $ 1,335 | $ 1,486 | $ 35,801 | $ 30,742 |
Liability for income taxes associated with uncertain tax positions | 9,746 |  | 9,746 |  |
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate | 1,445 |  | 1,445 |  |
Unrecognized tax benefit liabilities decrease | 105 |  | 105 |  |
Increase in gross liability for uncertain tax positions | 237 |  | 446 |  |
Provision expense (benefit) for income taxes related to interest and penalties | 52 | $ 132 | 46 | $ 241 |
Income tax accrued for payment of interest and penalties | $ 1,664 |  | $ 1,664 |  | $ 1,618

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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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