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v3.19.3.a.u2

Debt (Additional Information) (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Feb. 17, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio, cash dividends, maximum | 2.75 |  |  |  |  |
Borrowings under revolving credit facility | $ 123,000,000 | $ 228,482,000 |  |  |  |
Interest expense on debt | 7,200,000 | 6,100,000 | $ 5,200,000 |  |  |
Line of credit fees | 576,000 | 573,000 | 555,000 |  |  |
Debt issuance amortization costs | 552,000 | 552,000 | 549,000 |  |  |
Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Allowed dividend payments | 20,000,000.0 |  |  |  |  |
Third Amended Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio, maximum |  |  |  |  |  | 3.25
Maximum leverage ratio option |  |  |  |  |  | 3.50
Interest coverage ratio, minimum |  |  |  |  |  | 3.00
Repayments of lines of credit | 105,500,000 | 5,000,000.0 | $ 110,200,000 |  |  |
Long-term line of credit | $ 1,200,000 | $ 1,700,000 |  |  |  |
Third Amended Credit Agreement | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |
Credit agreement, maximum borrowing capacity |  |  |  |  | $ 450,000,000.0 |
Line of credit facility, additional borrowing capacity |  |  |  |  | $ 175,000,000.0 |
Third Amended Credit Agreement | Minimum | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unused commitment fee, percentage | 0.20% |  |  |  |  |
Third Amended Credit Agreement | Maximum | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unused commitment fee, percentage | 0.30% |  |  |  |  |
Interest rate swap contract | Third Amended Credit Agreement | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, amount of hedged item |  |  |  | $ 75,000,000.0 |  |
Secured Revolving Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, lower range basis spread on variable rate |  |  | 0.375% |  |  |
Debt instrument, higher range basis spread on variable rate |  |  | 0.75% |  |  |
Secured Revolving Credit Agreement | Eurocurrency loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR spread minimum |  |  | 1.375% |  |  |
LIBOR spread maximum |  |  | 1.75% |  |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis points spread | 1.375% |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Third Amended Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis points spread | 1.375% |  | 0.50% |  |  |
Adjusted London Interbank Offered Rate (LIBOR) | Third Amended Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis points spread |  |  | 1.00% |  |  |

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