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Long-term debt - Additional Information (Detail)
 9 Months Ended 1 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2013
EUR (€)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
EUR (€)
Aug. 30, 2010
USD ($)
Sep. 30, 2012
Revolving Credit Facility [Member]
USD ($)
Jun. 30, 2012
Revolving Credit Facility [Member]
USD ($)
May 31, 2012
Revolving Credit Facility [Member]
USD ($)
Sep. 30, 2013
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2012
Revolving Credit Facility [Member]
USD ($)
Aug. 30, 2010
Revolving Credit Facility [Member]
USD ($)
Sep. 30, 2013
LIBOR [Member]
Revolving Credit Facility [Member]
Dec. 31, 2012
LIBOR [Member]
Revolving Credit Facility [Member]
Aug. 30, 2010
Term Loan Facility [Member]
USD ($)
May 31, 2012
Term Loan Facility [Member]
USD ($)
Sep. 30, 2013
Term Loan Facility [Member]
USD ($)
Dec. 31, 2012
Term Loan Facility [Member]
USD ($)
Sep. 30, 2013
Term Loan Facility [Member]
Base rate [Member]
Maximum [Member]
Sep. 30, 2013
New Credit Agreement [Member]
LIBOR [Member]
Maximum [Member]
Sep. 30, 2013
New Credit Agreement [Member]
Base rate [Member]
Maximum [Member]
Sep. 30, 2013
Prior Credit Agreement [Member]
LIBOR [Member]
Dec. 31, 2012
Prior Credit Agreement [Member]
LIBOR [Member]
Debt Instrument [Line Items]                                              
Debt instrument term (in years)                   5 years             5 years            
Maximum borrowing capacity   $ 7,800,000 € 5,800,000 $ 7,600,000 € 5,800,000             $ 200,000,000                      
Maximum borrowing capacity                             100,000,000                
Maximum additional borrowing capacity available           50,000,000                                  
Repayment of debt obligation 188,695,000                             87,500,000              
Repayment of debt obligation             20,000,000 20,000,000 57,500,000                            
Amount outstanding   0   100,000           20,000,000 20,000,000                        
Margin on variable rate                         2.50% 2.50%           3.25% 2.25%    
Variable rate basis                                     LIBOR        
Effective interest rate (as a Percent)                                           2.70% 2.70%
Revolving credit facility due date                   Aug. 30, 2015                          
Amount of restricted net assets   200,500,000   213,400,000                                      
Restricted cash   22,732,000   21,314,000                                      
Debt issuance costs incurred                                 5,000,000            
Write-off of debt issue costs                               800,000              
Deferred debt issuance costs, net                                 $ 1,300,000 $ 1,800,000