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Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Aug. 21, 2018
Feb. 24, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]          
Credit facility, interest rate description     The applicable margin for borrowings under the Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.25% to 1.25% with respect to base rate borrowings and between 1.25% and 2.25% with respect to LIBOR rate borrowings. Interest is due and payable monthly. The interest rate in effect at September 30, 2018, for the Credit Facility was 3.99%    
Credit facility, interest rate margin above federal fund rate     0.50%    
Credit facility, interest rate margin above one-month LIBOR rate     1.00%    
Credit facility, borrowing rate     3.99%    
Debt Issuance cost     $ 13,993,000   $ 10,521,000
Debt Issuance cost paid     $ 7,253,000 $ 5,340,000  
Credit Facility maturity date     Feb. 24, 2022    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Unused borrowings     $ 500,000,000    
Term Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility amount outstanding     288,900,000    
Senior Notes [Member]          
Debt Instrument [Line Items]          
Senior notes amount outstanding     400,000,000    
Senior Notes 2026 [Member]          
Debt Instrument [Line Items]          
Senior notes amount outstanding $ 400,000,000        
Issue price percentage of senior notes of the principal amount 100.00%        
Percentage of interest rate on notes 5.75%        
Senior Notes maturity date Aug. 15, 2026        
Debt Issuance cost     7,300,000    
Debt Issuance cost paid     $ 7,300,000    
Maturity date of senior notes     Aug. 15, 2026    
Senior Note Due 2022 [Member]          
Debt Instrument [Line Items]          
Percentage of interest rate on notes     6.375%    
Credit Agreement [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Credit facility, interest rate margin above base rate     0.25%    
Credit facility, interest rate margin above LIBOR rate     1.25%    
Credit Agreement [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Credit facility, interest rate margin above base rate     1.25%    
Credit facility, interest rate margin above LIBOR rate     2.25%    
Credit Agreement [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum borrowing capacity   $ 500,000,000      
Credit facilities, maturity   5 years      
Credit Agreement [Member] | Term Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum borrowing capacity   $ 415,000,000      
Credit facilities, maturity   5 years      
Multi-year License Agreement [Member]          
Debt Instrument [Line Items]          
Financed internally-used software     $ 11,900,000    
Annual payments due date     Through June 2023    
Other current liabilities     $ 4,700,000    
Other non-current liabilities     6,900,000    
Outstanding other Long-term Debt     $ 11,600,000    
Parent Company and Domestic Subsidiaries [Member]          
Debt Instrument [Line Items]          
Percentage of capital stock pledged as collateral     100.00%    
Foreign Subsidiaries [Member]          
Debt Instrument [Line Items]          
Percentage of capital stock pledged as collateral     65.00%