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Long-term debt - Additional Information (Detail)
 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2013
EUR (€)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
EUR (€)
Sep. 30, 2012
Revolving Credit Facility [Member]
USD ($)
Jun. 30, 2012
Revolving Credit Facility [Member]
USD ($)
May 31, 2012
Revolving Credit Facility [Member]
USD ($)
Aug. 31, 2010
Revolving Credit Facility [Member]
Jun. 30, 2013
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2012
Revolving Credit Facility [Member]
USD ($)
Aug. 30, 2010
Revolving Credit Facility [Member]
USD ($)
Jun. 30, 2013
Revolving Credit Facility [Member]
LIBOR [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
LIBOR [Member]
May 31, 2012
Term Loan Facility [Member]
USD ($)
Aug. 31, 2010
Term Loan Facility [Member]
USD ($)
Jun. 30, 2013
Term Loan Facility [Member]
USD ($)
Dec. 31, 2012
Term Loan Facility [Member]
USD ($)
Jun. 30, 2013
Term Loan Facility [Member]
Base rate [Member]
Maximum [Member]
Aug. 30, 2010
New Credit Agreement [Member]
USD ($)
Jun. 30, 2013
New Credit Agreement [Member]
LIBOR [Member]
Maximum [Member]
Jun. 30, 2013
New Credit Agreement [Member]
Base rate [Member]
Maximum [Member]
Jun. 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   $ 7,500,000 € 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 168,695,000                           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   217,100,000   171,900,000                                        
Restricted cash   20,601,000   21,314,000                                        
Debt issuance costs incurred                                 5,000,000              
Write-off of debt issue costs                             800,000                  
Deferred debt issuance costs, net                                 $ 1,500,000 $ 1,800,000