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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%