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Debt - Summary of Debt (Parenthetical) (Detail) - 9 months ended Sep. 30, 2015
€ in Thousands, $ in Thousands
EUR (€)
USD ($)
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank   $ 28
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Interest rate 3.82% 3.82%
Term loans, year of maturity 2016-01 2016-01
Term Loan [Member] | Debt Instrument, Redemption, through September 2016 [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank   $ 3,200
Term loans, year of maturity 2017-09 2017-09
Term Loan [Member] | Debt Instrument, Redemption, through September 2017 [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank   $ 4,300
Term loans, year of maturity 2018-09 2018-09
Term Loan [Member] | Debt Instrument, Redemption, through August 2018 [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank   $ 5,300
Term loans, year of maturity 2020-09 2020-09
U S Dollar Euro [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings under Euro denominated note payable to bank | € € 25