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Credit Arrangements and Debt Obligations - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Nov. 07, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 16, 2017
Jan. 25, 2016
Debt Instrument [Line Items]            
Borrowings on revolving credit facility   $ 127,100 $ 76,000      
Amortization of deferred financing costs   1,400 2,200 $ 2,200    
Amortization of original debt issuance costs   400 1,300 1,400    
Loss on extinguishment of debt   0 $ (11,117) $ 0    
Proceeds of debt used for business combination $ 150,000          
Fees associated with amendments of debt   $ 2,800        
Derivative, average fixed interest rate         3.90%  
Derivative, variable interest rate         0.75%  
Bank Base Rate            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   1.00%        
Eurocurrency            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   2.00%        
Senior Credit Facilities            
Debt Instrument [Line Items]            
Line of credit, maximum borrowing capacity   $ 1,300,000        
Debt issuance, principal amount   225,000       $ 100,000
Term Loan | Senior Credit Facilities            
Debt Instrument [Line Items]            
Line of credit, maximum borrowing capacity   $ 1,100,000        
Effective interest rate for the term loans   3.57% 3.50% 4.10%    
Debt issuance, weighted average interest rate   3.53% 3.90% 4.10%    
Term Loan | Senior Credit Facilities | Bank Base Rate | Minimum            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   1.75%        
Term Loan | Senior Credit Facilities | Eurocurrency | Minimum            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   0.75%        
Revolving Credit Facility | Senior Credit Facilities            
Debt Instrument [Line Items]            
Debt issuance, principal amount   $ 225,000       $ 922,500
Borrowings on revolving credit facility   $ 127,100        
Effective interest rate for the term loans   3.70% 5.50% 5.25%    
Debt issuance, weighted average interest rate   4.10% 4.20% 3.80%    
Increase (Decrease) in Deferred Charges 6,700          
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction $ 2,700          
Revolving Credit Facility | Senior Credit Facilities | Bank Base Rate | Minimum            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   0.50%        
Revolving Credit Facility | Senior Credit Facilities | Bank Base Rate | Maximum            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   1.00%        
Revolving Credit Facility | Senior Credit Facilities | Eurocurrency | Minimum            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base   1.50%        
Revolving Credit Facility | Senior Credit Facilities | Eurocurrency | Maximum            
Debt Instrument [Line Items]            
Debt issuance interest rate, percentage added to base     2.00%      
Secured Term Loan | Senior Credit Facilities            
Debt Instrument [Line Items]            
Debt issuance, quarterly principal payments   $ 2,700        
Debt instrument term 7 years          
Interest Rate Swap            
Debt Instrument [Line Items]            
Derivative, notional amount         $ 500,000