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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Jan. 01, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |
Finance lease, right-of-use asset | $ 400 |  | $ 400 |  |  | $ 505 |
Operating lease liabilities, current and long-term portions | 33,319 |  | 33,319 |  |  | 28,577 |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 38,223 | $ 13,495 | 46,415 | $ 36,750 |  |  |
Income tax expense | 1,941 | $ 2,569 | 5,576 | $ 7,515 |  |  |
Deferred tax liabilities, long-term, net | 35,523 |  | 35,523 |  |  | 24,408 |
Retained earnings | $ 124,152 |  | $ 124,152 |  |  | 83,313 |
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  |  | $ 1,800 |  |
Income tax expense |  |  |  |  | $ 387 |  |
Other Assets, Current |  |  |  |  |  | 1,800 |
Deferred tax liabilities, long-term, net |  |  |  |  |  | 387 |
Retained earnings |  |  |  |  |  | $ 1,413 |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |
Finance lease, right-of-use asset |  |  |  |  |  |  | $ 35,939

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