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Debt and Short-Term Borrowings - Total Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Note payable $ 4,200  
Total debt 669,147 $ 693,912
Term A due on April 17, 2018 [Member] | Senior Secured Credit Facilities [Member]    
Debt Instrument [Line Items]    
Credit facility [1],[2] 262,323 277,239
Term B due on April 17, 2020 [Member] | Senior Secured Credit Facilities [Member]    
Debt Instrument [Line Items]    
Credit facility [2],[3] 386,172 389,340
Expiring on April 17, 2018 [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility 17,000 23,000
Note Payable due on October 1, 2017 [Member]    
Debt Instrument [Line Items]    
Note payable [2] 2,967 $ 4,333
Note Payable due on July 31, 2017 [Member]    
Debt Instrument [Line Items]    
Note payable [2] $ 685  
[1] Applicable margin of 2.25% and 2.50% at December 31, 2015 and 2014, respectively.
[2] Net of unaccreted discount.
[3] Subject to a minimum rate ("LIBOR floor") of 0.75% plus applicable margin of 2.50% and 2.75% at December 31, 2015 and 2014, respectively.