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Debt and Short-Term Borrowings - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]    
Maximum secured leverage ratio 6.60  
Note payable $ 5.0  
Non interest bearing financing agreement $ 1.1 $ 4.6
Note Payable [Member]    
Debt Instrument [Line Items]    
Debt instrument, term 36 months  
Senior Secured Term Loan A [Member]    
Debt Instrument [Line Items]    
Secured credit facilities $ 270.0  
Debt, maturity date Apr. 17, 2018  
Senior Secured Term Loan A [Member] | Commencing On September 30, 2013 To June 2016 [Member]    
Debt Instrument [Line Items]    
Original principal amount 1.25%  
Senior Secured Term Loan A [Member] | Commencing On September 30, 2016 To June 30, 2017 [Member]    
Debt Instrument [Line Items]    
Original principal amount 1.875%  
Senior Secured Term Loan A [Member] | Commencing On September 30, 2017 To March 31, 2018 [Member]    
Debt Instrument [Line Items]    
Original principal amount 2.50%  
Senior Secured Term Loan A [Member] | LIBOR Floor [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 2.00%  
Senior Secured Term Loan A [Member] | LIBOR Floor [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 2.50%  
Senior Secured Term Loan A [Member] | Base Rate [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 1.00%  
Senior Secured Term Loan A [Member] | Base Rate [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 1.50%  
Senior Secured Term Loan B [Member]    
Debt Instrument [Line Items]    
Secured credit facilities $ 392.0  
Original principal amount 0.25%  
Debt, maturity date Apr. 17, 2020  
Debt instrument description The LIBOR Rate and Base Rate are subject to floors of 0.75% and 1.75%, respectively.  
Senior Secured Term Loan B [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 0.75%  
Senior Secured Term Loan B [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 1.75%  
Senior Secured Term Loan B [Member] | LIBOR Floor [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 2.50%  
Senior Secured Term Loan B [Member] | LIBOR Floor [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 2.75%  
Senior Secured Term Loan B [Member] | Base Rate [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 1.50%  
Senior Secured Term Loan B [Member] | Base Rate [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Margin interest rate 1.75%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Secured credit facilities $ 100.0  
Debt, maturity date Apr. 17, 2018  
Revolving Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Commitment fee for the unused portion 0.125%  
Revolving Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Commitment fee for the unused portion 0.375%