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v3.19.1

Long-Term Debt - Additional Information (Details) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 04, 2019 USD ($) | Sep. 07, 2018 USD ($) | Mar. 31, 2019 GBP (£) | Mar. 31, 2019 USD ($) | Jan. 22, 2016 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 600,000,000.0 |  |  |
Weighted average revolving interest rate, percentage |  |  | 3.46% | 3.46% |
Line of credit facility, remaining borrowing capacity |  |  |  | $ 349,800,000 |
Debt instrument, collateral amount |  |  |  | 600,000 |
Standby Letters of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from lines of credit |  |  |  | 10,200,000 |
Senior Revolving Credit Facility Maturing in 2023 | Standby Letters of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from lines of credit |  |  |  | 2,700,000 |
Multi-currency Notes Due in 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Covenant, Consolidated Leverage Ratio In Period Of Acquisition, Maximum | 4.00 |  |  |  |
Notes Payable | Multi-currency Notes Due in 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount |  |  |  | 71,500,000 | £ 54,900,000.0
Annual installment debt payments |  |  | £ 6,100,000.0 | 7,900,000 |
Debt instrument, stated interest rate percentage |  |  |  |  | 3.40%
Debt instrument, term |  | 3 years |  |  |
Additional senior notes available for request |  | $ 150,000,000 |  |  |
Senior notes payable |  |  |  | 0 |
Minimum fixed charges coverage ratio (not less than) | 1.50 |  |  |  |
Maximum consolidated leverage ratio (not to exceed) | 3.50 |  |  |  |
Notes Payable | Master Note Facility Due in 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, term | 3 years |  |  |  |
Additional senior notes available for request | $ 150,000,000 |  |  |  |
Senior notes payable |  |  |  | $ 0 |
Base Rate | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin, percentage |  | 0.00% |  |  |
Federal Funds Open Rate | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin, percentage |  | 0.50% |  |  |
Overnight Bank Funding Rate | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin, percentage |  | 0.50% |  |  |
London Interbank Offered Rate (LIBOR) | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin, percentage |  | 1.00% |  |  |
Minimum | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin, percentage |  | 0.00% |  |  |
Maximum | Senior Revolving Credit Facility Maturing in 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin, percentage |  | 175.00% |  |  |

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