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Senior Debt - Summary of Debt (Parenthetical) (Detail) - 3 months ended Mar. 31, 2016
$ in Millions
USD ($)
EUR (€)
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Term loans, year of maturity 2016-01 2016-01
Interest rate 3.82% 3.82%
U S Dollar Euro [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank | €   € 25,000
Term Loan [Member] | Debt Instrument, Redemption, through September 2017 [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank $ 3.2  
Term loans, year of maturity 2017-09 2017-09
Term Loan [Member] | Debt Instrument, Redemption, through September 2018 [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank $ 4.3  
Term loans, year of maturity 2018-09 2018-09
Term Loan [Member] | Debt Instrument, Redemption, through September 2020 [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank $ 5.3  
Term loans, year of maturity 2020-09 2020-09