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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 03, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |
Increase in income tax expense |  | $ 576 |  |  |  |
Income tax expense |  | $ 1,954 | $ 1,378 | $ 5,015 | $ 3,672 |
Effective tax rate |  | 32.10% | 31.30% | 29.20% | 27.90% |
Internal Revenue Service |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Amount paid to IRS | $ 11,580 |  |  |  |  |
Deferred Tax Assets And Income Taxes Payable |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Prior period reclassification adjustment |  |  |  |  |  | $ 12,598
State and Local Jurisdiction | Minimum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income Tax Examination Period |  |  |  | 2012 |  |
State and Local Jurisdiction | Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income Tax Examination Period |  |  |  | 2015 |  |
ASU 2016-09 |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Discrete tax benefit |  |  |  | $ (333) |  |

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