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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax at U.S. federal statutory rates |  |  |  |  |  |  |  |  | $ 19,507 | $ 16,766 | $ 26,012
State taxes (net of federal benefit) |  |  |  |  |  |  |  |  | 4,774 | 3,745 | 2,724
Business meals and entertainment — non-deductible |  |  |  |  |  |  |  |  | 987 | 915 | 820
Change in valuation allowance |  |  |  |  |  |  |  |  | 932 | 264 | 221
Reserves for uncertain tax positions |  |  |  |  |  |  |  |  | (263) | (1,124) | (35)
Share-based compensation |  |  |  |  |  |  |  |  | (4,773) | (3,260) | (3,837)
Impact of the Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |  |  |  | (2,487)
Non-deductible expenses |  |  |  |  |  |  |  |  | 713 | 785 | 236
Other, net |  |  |  |  |  |  |  |  | (37) | 176 | (366)
Provision for income taxes from continuing operations | $ (3,164) | $ 6,069 | $ 5,322 | $ 13,613 | $ (1,424) | $ 3,297 | $ 3,238 | $ 13,156 | $ 21,840 | $ 18,267 | $ 23,288
Effective income tax rate |  |  |  |  |  |  |  |  | 23.50% | 22.90% | 31.30%

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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