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Long-Term Debt - Additional Information (Details) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 22, 2023 GBP (£) | Jan. 22, 2016 GBP (£) | Jun. 30, 2018 USD ($) | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  | $ 316,700,000 |
Line of credit facility, maximum borrowing capacity |  |  | 575,000,000.0 |
Debt instrument, collateral amount |  |  | 3,200,000 |
Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from lines of credit |  |  | $ 15,100,000 |
2006 Senior Notes Payable Through 2021, 5.41% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, stated interest rate percentage |  |  | 5.41% | 5.41%
Senior Revolving Credit Facility Maturing in 2020 | Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from lines of credit |  |  | $ 6,200,000 |
Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average revolving interest rate, percentage |  |  | 3.31% |
Notes Payable | Multi-currency Notes Due in 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | £ 54,900,000.0 | $ 72,500,000 |
Debt instrument, stated interest rate percentage |  | 3.40% |  |
Minimum fixed charges coverage ratio (not less than) |  | 1.50 |  |
Maximum consolidated leverage ratio (not to exceed) |  | 3.25 |  |
Notes Payable | 2006 Senior Notes Payable Through 2021, 5.41% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, stated interest rate percentage |  | 5.41% |  |
Federal Funds Open Rate | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin, percentage |  |  | 0.50% |
London Interbank Offered Rate (LIBOR) | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin, percentage |  |  | 1.00% |
Minimum | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin, percentage |  |  | 0.00% |
Maximum | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin, percentage |  |  | 175.00% |
Scenario, Forecast | Notes Payable | Multi-currency Notes Due in 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual installment debt payments | £ 6,100,000.0 |  | $ 8,100,000 |

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