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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal tax expense at statutory rate |  |  |  |  |  |  |  |  | $ 14,090 | $ 13,632 | $ 13,349
Increase (reduction) in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
State tax, net of federal benefit |  |  |  |  |  |  |  |  | 1,253 | 1,275 | 1,098
Non-deductible compensation |  |  |  |  |  |  |  |  |  |  | 378
Tax rate change | $ (3,100) |  |  |  |  |  |  |  | (3,122) |  |
Excess tax benefits from share-based awards |  |  |  |  |  |  |  |  | (1,603) |  |
Research and development tax credits |  |  |  |  |  |  |  |  | (400) |  |
Other |  |  |  |  |  |  |  |  | 76 | 10 | (51)
Total | $ 923 | $ 3,235 | $ 3,751 | $ 2,385 | $ 4,014 | $ 4,020 | $ 3,668 | $ 3,215 | $ 10,294 | $ 14,917 | $ 14,774

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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