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Summary of Significant Accounting Policies - Summary of Revision of Prior Period Financial Statements (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement: |  |  |  |
Earnings before income tax | $ 81,556 | $ 59,151 | $ 58,119 |
Income tax expense | 21,866 | 10,285 | 16,220 |
Net income | $ 59,690 | $ 48,866 | $ 41,899 |
Basic EPS | $ 1.83 | $ 1.48 | $ 1.17 |
Diluted EPS | $ 1.81 | $ 1.47 | $ 1.16 |
Balance Sheet: |  |  |  |
Deferred income tax asset - long term | $ 73,912 | $ 69,096 |  |
Total non-current assets |  | 364,969 |  |
Total assets | 1,022,839 | 738,832 |  |
Accumulated other comprehensive (loss) income | (14,982) | (42,355) | $ (39,500) | $ (20,444)
Accumulated earnings | 472,782 | 413,092 |  |
Total liabilities and shareholders’ equity | $ 1,022,839 | 738,832 |  |
As Reported |  |  |  |
Income Statement: |  |  |  |
Earnings before income tax |  | 59,151 |  |
Income tax expense |  | 21,645 |  |
Net income |  | $ 37,506 |  |
Basic EPS |  | $ 1.13 |  |
Diluted EPS |  | $ 1.13 |  |
Balance Sheet: |  |  |  |
Deferred income tax asset - long term |  | $ 57,650 |  |
Total non-current assets |  | 353,523 |  |
Total assets |  | 727,386 |  |
Accumulated other comprehensive (loss) income |  | (42,441) |  |
Accumulated earnings |  | 401,732 |  |
Total liabilities and shareholders’ equity |  | 727,386 |  |
Adjustment |  |  |  |
Income Statement: |  |  |  |
Income tax expense |  | (11,360) |  |
Net income |  | $ 11,360 |  |
Basic EPS |  | $ 0.35 |  |
Diluted EPS |  | $ 0.34 |  |
Balance Sheet: |  |  |  |
Deferred income tax asset - long term |  | $ 11,446 |  |
Total non-current assets |  | 11,446 |  |
Total assets |  | 11,446 |  |
Accumulated other comprehensive (loss) income |  | 86 |  |
Accumulated earnings |  | 11,360 |  |
Total liabilities and shareholders’ equity |  | $ 11,446 |  |

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