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Debt - Additional Information (Detail) - USD ($)
3 Months Ended
Feb. 15, 2018
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Debt instrument principal amount   $ 810,952,000 $ 695,748,000
Senior Secured Term Loan [Member]      
Debt Instrument [Line Items]      
Debt instrument principal amount   345,000,000  
Senior Secured Revolving Facility [Member]      
Debt Instrument [Line Items]      
Credit facility, amount available   899,200,000  
Senior Secured Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt instrument principal amount   465,000,000 350,000,000
1.25% Cash Convertible Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument principal amount   $ 345,000,000 [1] $ 345,000,000
Interest rate   1.25%  
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Portion of facility available for issuance of letters of credit $ 50,000,000    
Line of Credit [Member]      
Debt Instrument [Line Items]      
Portion of facility available for issuance of swingline loans 10,000,000    
Senior Secured Revolving Facility [Member]      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 900,000,000    
Senior secured credit facilities term, years 5 years    
Credit facility, maximum borrowing capacity, foreign currencies $ 100,000,000    
Senior Secured Term Loan [Member]      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 400,000,000    
Senior secured credit facilities term, years 5 years    
Line of credit facility, frequency of payments   The Term Loan is repayable in quarterly installments, which began on June 30, 2018.  
Second Amended Credit Agreement [Member] | Senior Secured Term Loan [Member]      
Debt Instrument [Line Items]      
Debt instrument principal amount   $ 345,000,000  
Second Amended Credit Agreement [Member] | Senior Secured Revolving Facility [Member]      
Debt Instrument [Line Items]      
Debt instrument principal amount   $ 120,000,000  
Second Amended Credit Agreement [Member] | Senior Secured Revolving Facility [Member] | United States dollars [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, effective percentage   4.50%  
Second Amended Credit Agreement [Member] | Senior Secured Revolving Facility [Member] | LIBOR Rate [Member]      
Debt Instrument [Line Items]      
Debt instrument, variable interest rate   2.00%  
Second Amended Credit Agreement [Member] | Senior Secured Credit Facility [Member]      
Debt Instrument [Line Items]      
Letters of credit outstanding   $ 800,000  
[1] Assumes no cash conversions of the 1.25% Notes prior to their maturity on July 1, 2020.