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Retirement Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Employee | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching contribution to 401(k) plan | $ 805,000 | $ 734,000 | $ 667,000
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 | 4,092,000 | 3,308,000 | 3,309,000
Unrecognized actuarial loss | 4,070,000 | 4,345,000 |
Unrecognized actuarial net of tax | 2,191,000 | 2,238,000 |
Accumulated benefit obligation for defined benefit pension plan | 17,916,000 | 16,964,000 |
Net periodic benefit cost over the next fiscal year | 380,000 |  |
Incurred settlement cost | $ 237,000 | $ 259,000 | $ 415,000
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% |
Expected future employer contributions | $ 0 |  |
Employer contribution | 2,000,000 | $ 500,000 |
Fund status | 1,390,000 | (814,000) |
Shortfall Agreements [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension shortfall expense | 18,000 | 201,000 | $ 364,000
Interest expense | $ 18,000 | 11,000 | 10,000
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 | $ 2,308,000 | 1,984,000 |
Expenses recorded for supplemental retirement plan | 365,000 | 243,000 | 299,000
Total distribution to participant | $ 41,000 | $ 34,000 | $ 22,000

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