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Retirement Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) Employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan name | 401(k) plan |  |
Matching contribution to 401(k) plan | $ 892,000 | $ 805,000 | $ 734,000
Employer matching contribution description | The Company’s matching contribution is 100% of an employee’s first three percent contributed and 50% of the next two percent contributed. |  |
Pension plan eligibility age of employees | 20 years 6 months |  |
Pension plan eligibility service period of employees | 6 months |  |
Pension plan eligibility service hours of employees | 1000 hours |  |
Additional benefits under pension plan | $ 0 |  |
Interest expense | 7,570,000 | 4,092,000 | 3,308,000
Unrecognized actuarial loss in accumulated other comprehensive loss, net of tax | 3,799,000 | 4,070,000 |
Unrecognized actuarial loss in accumulated other comprehensive loss, tax | 1,010,000 | 2,191,000 |
Accumulated benefit obligation for defined benefit pension plan | 13,338,000 | 17,916,000 |
Estimated net loss that will be amortized over the next fiscal year | 149,000 |  |
Incurred settlement cost | $ 1,188,000 | $ 237,000 | $ 259,000
Rate of compensation increase used to determine the benefit obligation | 0.00% | 0.00% | 0.00%
Long-term rate of return on plan assets | 7.00% | 7.00% | 7.00%
Plan assets allocation | $ 15,572,000 | $ 19,306,000 | $ 16,150,000
Expected future employer contributions | 0 |  |
Employer contribution | 0 | 2,000,000 |
Fund status | 2,234,000 | 1,390,000 |
Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets allocation | 2,689,000 |  |
Shortfall Agreements [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension shortfall expense | 180,000 | 18,000 | 201,000
Interest expense | $ 24,000 | 18,000 | 11,000
Number of individuals under plan | Employee | 10 |  |
Supplemental Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum retirement year for participants | 10 years |  |
Liability recorded for supplemental retirement plan | $ 2,570,000 | 2,308,000 |
Expenses recorded for supplemental retirement plan | 351,000 | 365,000 | 243,000
Total distribution to participant | $ 87,000 | $ 41,000 | $ 34,000

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