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Income Taxes - Schedule of Income (Loss) Before Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
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Jan. 01, 2018 | Dec. 21, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate, amount |  |  |  |  |  |  |  |  |  |  | $ 19,121 | $ 43,357 | $ 43,608
State income tax, amount |  |  |  |  |  |  |  |  |  |  | 4,067 | 3,835 | 4,548
Tax-exempt interest, net of disallowance amount |  |  |  |  |  |  |  |  |  |  | (360) | (381) | (237)
Bank-owned life insurance, amount |  |  |  |  |  |  |  |  |  |  | (1,547) | (2,675) | (1,716)
Equity-based compensation, amount |  |  |  |  |  |  |  |  |  |  | (547) | (10,741) | (3,659)
Unrecorded basis difference in foreign subsidiaries, amount |  |  |  |  |  |  |  |  |  |  | 343 | 4,527 | 2,830
Enactment of federal tax reform, amount |  |  |  |  |  |  |  |  |  |  | (21) | 5,505 | 0
Other, amount |  |  |  |  |  |  |  |  |  |  | (1,927) | 961 | 519
Income tax expense |  |  | $ 5,109 | $ 28 | $ 6,820 | $ 7,402 | $ 10,806 | $ 14,899 | $ 12,327 | $ 7,009 | $ 19,359 | $ 45,042 | $ 45,893
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate, percentage of pretax income | 21.00% | 35.00% |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
State income tax, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 4.47% | 3.10% | 3.65%
Tax-exempt interest, net of disallowance percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (0.40%) | (0.31%) | (0.19%)
Bank-owned life insurance, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (1.70%) | (2.16%) | (1.38%)
Equity-based compensation, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (0.60%) | (8.67%) | (2.94%)
Unrecorded basis difference in foreign subsidiaries, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 0.38% | 3.65% | 2.27%
Enactment of federal tax reform, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (0.02%) | 4.44% | 0.00%
Other, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (2.12%) | 0.78% | 0.42%
Effective income tax rate, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 21.26% | 36.36% | 36.83%
Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation, amount |  |  |  |  |  |  |  |  |  |  | $ 230 | $ 654 | $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.53% | 0.00%

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