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Long-Term Debt - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 22, 2016 GBP (£) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 GBP (£) | Sep. 30, 2017 USD ($) | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average revolving interest rate, percentage |  |  |  | 3.33% | 3.33% |  |
Line of credit facility, remaining borrowing capacity |  | $ 341,700,000 |  | $ 341,700,000 |  |  |
Line of credit facility, maximum borrowing capacity |  | 600,000,000.0 |  | 600,000,000.0 |  |  |
Gain (Loss) on Extinguishment of Debt |  | (1,494,000) | $ 0 | (1,494,000) |  | $ 0 |
Debt instrument, collateral amount |  | 400,000 |  | 400,000 |  |  |
Standby Letters of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from lines of credit |  | 11,100,000 |  | 11,100,000 |  |  |
Senior Revolving Credit Facility Maturing in 2023 | Standby Letters of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from lines of credit |  | $ 3,000,000 |  | $ 3,000,000 |  |  |
2006 Senior Notes Payable Through 2021, 5.41% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  | 5.41% |  | 5.41% |  |  | 5.41%
Gain (Loss) on Extinguishment of Debt |  | $ 1,500,000 |  |  |  |  |
Notes Payable | Multi-currency Notes Due in 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount | £ 54,900,000.0 | 71,500,000 |  | $ 71,500,000 |  |  |
Annual installment debt payments |  |  |  | 7,900,000 | £ 6,100,000.0 |  |
Debt instrument, stated interest rate percentage | 3.40% |  |  |  |  |  |
Additional Senior Notes Available for Request |  | $ 150,000,000 |  | $ 150,000,000 |  |  |
Minimum fixed charges coverage ratio (not less than) | 1.50 |  |  |  |  |  |
Maximum consolidated leverage ratio (not to exceed) | 3.50 |  |  |  |  |  |
Federal Funds Open Rate | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin, percentage |  |  |  | 0.50% | 0.50% |  |
Overnight Bank Funding Rate | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin, percentage |  |  |  | 0.50% | 0.50% |  |
London Interbank Offered Rate (LIBOR) | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin, percentage |  |  |  | 1.00% | 1.00% |  |
Minimum | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin, percentage |  |  |  | 0.00% | 0.00% |  |
Maximum | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin, percentage |  |  |  | 175.00% | 175.00% |  |

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