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Debt and Short-Term Borrowings - Total Debt (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 565,469 $ 616,740
Notes Payable    
Debt Instrument [Line Items]    
Note payable 400 1,000
Note Payable due on August 31, 2019 | Notes Payable    
Debt Instrument [Line Items]    
Note payable $ 0 584
Fixed interest rate 7.50%  
Note Payable due on April 30, 2021 | Notes Payable    
Debt Instrument [Line Items]    
Note payable $ 330 418
Term A due on April 17, 2018 | Credit Facility    
Debt Instrument [Line Items]    
Credit facility 0 $ 26,690
Term A due on April 17, 2018 | Credit Facility | LIBOR    
Debt Instrument [Line Items]    
Margin interest rate   2.25%
Term A due on January 17, 2020 | Credit Facility    
Debt Instrument [Line Items]    
Credit facility $ 189,974 $ 200,653
Term A due on January 17, 2020 | Credit Facility | LIBOR    
Debt Instrument [Line Items]    
Margin interest rate 2.50% 2.50%
Term B due on April 17, 2020 | Credit Facility    
Debt Instrument [Line Items]    
Credit facility $ 375,165 $ 376,395
Term B due on April 17, 2020 | Credit Facility | LIBOR    
Debt Instrument [Line Items]    
Margin interest rate 2.50% 2.50%
Minimum variable rate 0.75% 0.75%
Senior Secured Revolving Credit Facility | Credit Facility    
Debt Instrument [Line Items]    
Credit facility $ 0 $ 12,000
Senior Secured Revolving Credit Facility | Credit Facility | LIBOR    
Debt Instrument [Line Items]    
Margin interest rate 2.50% 2.50%