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Director and Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Duration of service for eligibility | 3 months |  |
Employer matching contribution, percent | 3.00% |  |
Maximum annual contribution per employee, percent | 50.00% |  |
Employer's maximum additional match, percentage | 2.00% |  |
Employer's discretionary matching contribution | 4.00% |  |
Cash contribution to profit-sharing plan | $ 3.0 | $ 2.7 | $ 2.5
Noncontributory Defined Benefit Multi-Employer Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retirement plan expense | $ 0.7 | $ 0.6 | $ 0.6

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