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Short and Long-Term Debt - Long-Term Debt Additional Information (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 22, 2016 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 11, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Maturity obligation, year one |  | $ 26,700,000 |  |
Maturity obligation, year two |  | 26,700,000 |  |
Maturity obligation, year three |  | 321,500,000 |  |
Maturity obligation, year four |  | 26,700,000 |  |
Maturity obligation, year 5 |  | 0 |  |
Maturity obligation, thereafter |  | 74,200,000 |  |
Bank guarantees and letters of credit, outstanding |  | 13,300,000 |  |
Restricted cash and cash equivalents |  | 3,600,000 | $ 1,200,000 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average revolver interest rate | 2.73% |  |  |
Unused senior revolving credit facility |  | 273,500,000 |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 575,000,000.0
Bank guarantees and letters of credit, outstanding |  | 6,600,000 |  |
Multi-currency Notes Due in 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable, principal amount | £ 54,900,000.0 | 74,200,000 |  |
Notes payable, annual repayment installments | £ 6,100,000.0 | $ 8,200,000 |  |
Notes payable, interest rate |  | 3.40% |  |
Minimum fixed charges coverage ratio (not less than) |  | 1.50 |  |
Consolidated leverage ratio (not to exceed) |  | 3.25 |  |
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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