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Short and Long-Term Debt - Long-Term Debt Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 22, 2016 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Maturity obligation, year one |  | $ 20,000,000 |
Maturity obligation, year two |  | 20,000,000 |
Maturity obligation, year three |  | 20,000,000 |
Maturity obligation, year four |  | 0 |
Maturity obligation, year 5 |  | 241,200,000.0 |
Maturity obligation, thereafter |  | 62,000,000 |
Bank guarantees and letters of credit, outstanding |  | 11,400,000 |
Restricted Cash and Cash Equivalents |  | $ 500,000 | $ 3,600,000
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average revolver interest rate |  | 3.47% |
Unused senior revolving credit facility |  | $ 363,500,000 |
Line of credit, maximum borrowing capacity |  | 600,000,000 |
Bank guarantees and letters of credit, outstanding |  | 3,100,000 |
Multi-currency Notes Due in 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, principal amount | £ 54,900,000.0 | 69,700,000 |
Notes payable, annual repayment installments | £ 6,100,000.0 | $ 7,700,000 |
Notes payable, interest rate |  | 3.40% |
Minimum fixed charges coverage ratio (not less than) |  | 1.50 |
Consolidated leverage ratio (not to exceed) |  | 3.50 |
Federal Funds Open Rate | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 0.50% |
Daily Libor Rate | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.00% |
Minimum | BASE or LIBOR | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 0.00% |
Maximum | BASE or LIBOR | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 17500.00% |

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