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Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Aug. 07, 2019
Feb. 15, 2018
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Debt instrument principal amount     $ 930,302,000 $ 695,748,000
Senior Secured Term Loan [Member]        
Debt Instrument [Line Items]        
Debt instrument principal amount     335,000,000  
Senior Secured Revolving Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, amount available     649,000,000.0  
Senior Secured Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument principal amount     585,000,000 350,000,000
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     $ 335,000,000.0  
Second Amended Credit Agreement [Member] | Senior Secured Revolving Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument principal amount     $ 250,000,000.0  
Second Amended Credit Agreement [Member] | Senior Secured Revolving Facility [Member] | United States dollars [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate, effective percentage     3.54%  
Second Amended Credit Agreement [Member] | Senior Secured Revolving Facility [Member] | LIBOR Rate [Member]        
Debt Instrument [Line Items]        
Debt instrument, variable interest rate     1.50%  
Second Amended Credit Agreement [Member] | Senior Secured Credit Facility [Member]        
Debt Instrument [Line Items]        
Letters of credit outstanding     $ 1,000,000.0  
Fees and other costs, incurred $ 800,000      
[1] Assumes no cash conversions of the 1.25% Notes prior to their maturity on July 1, 2020.