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Long-term Debt (Details Textual)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
CAD
Jun. 13, 2012
EUR (€)
Jun. 30, 2012
Canadian first-tier European subsidiaries [Member]
USD ($)
Jun. 30, 2012
Revolving European Credit Facility [Member]
USD ($)
Jun. 30, 2012
Revolving European Credit Facility [Member]
EUR (€)
Jun. 30, 2012
Letter of Credit [Member]
CAD
Jun. 30, 2012
Revolving North American Credit Facility [Member]
USD ($)
Dec. 31, 2011
Open Market Transactions [Member]
EUR (€)
Sep. 30, 2012
Term Loan [Member]
USD ($)
Jun. 30, 2012
Term Loan [Member]
USD ($)
Jun. 13, 2012
Term Loan [Member]
USD ($)
Jun. 30, 2012
Term Loan [Member]
Canadian first-tier European subsidiaries [Member]
Jun. 30, 2012
Term Loan [Member]
U.S. wholly-owned subsidiaries [Member]
Jun. 30, 2012
Term Loan [Member]
Maximum [Member]
Jun. 30, 2012
Term Loan [Member]
Minimum [Member]
Jun. 13, 2012
Term Loan [Member]
Minimum [Member]
Jun. 30, 2012
6.5% Senior Secured Notes [Member]
Mar. 31, 2011
6.5% Senior Secured Notes [Member]
USD ($)
Mar. 31, 2011
6.5% Senior Secured Notes [Member]
EUR (€)
Mar. 31, 2011
6.5% Senior Secured Notes [Member]
USD ($)
Jun. 30, 2012
6.5% Senior Secured Notes [Member]
Dec. 31, 2011
6.5% Senior Secured Notes [Member]
USD ($)
Jun. 13, 2012
6.5% Senior Secured Notes [Member]
EUR (€)
Dec. 31, 2011
6.5% Senior Secured Notes [Member]
Open Market Transactions [Member]
EUR (€)
Jun. 30, 2012
Base Rate [Member]
Revolving North American Credit Facility [Member]
Maximum [Member]
Jun. 30, 2012
Base Rate [Member]
Revolving North American Credit Facility [Member]
Minimum [Member]
Jun. 13, 2012
Base Rate [Member]
Term Loan [Member]
Jun. 30, 2012
LIBOR [Member]
Revolving North American Credit Facility [Member]
Maximum [Member]
Jun. 30, 2012
LIBOR [Member]
Revolving North American Credit Facility [Member]
Minimum [Member]
Jun. 13, 2012
LIBOR [Member]
Term Loan [Member]
Long Term Debt (Textual) [Abstract]                                                                  
Term Loan                         $ 400,000,000                                        
Percentage of Senior Secured Notes                                         6.50% 6.50% 6.50%     6.50%              
Outstanding Amount Of Senior Secured Notes         279,200,000                                         279,200,000              
Percentage of term loan issued amount to principal amount                           98.50%                                      
Amount of Term Loan Issued                           394,000,000                                      
Additional Term Loan                         100,000,000                                        
Minimum LIBOR rate                                     1.00%                            
Percentage spread on base rate                                                       1.00% 0.50% 3.75%      
Average interest rate of borrowing                         5.75%                                        
Average interest rate of borrowing from issuance                         6.25%                                        
Quarterly principal repayments                       5,000,000                                          
Term Loan Collateralization Priority                             65.00% 100.00%                                  
Note receivable pledged as collateral with related party                         362,100,000                                        
Maintenance of specified financial covenant                                 3.5 1.0                              
Minimum amount of debt default for using customary default provisions                         50,000,000                                        
Unamortized discount balance                         6,000,000                                        
Principal amount of debt redeemed or repurchased                     40,800,000                     80,000,000                      
Aggregate redemption or repurchase price on principal amount                                         115,700,000       57,600,000   40,600,000            
Repayment of debt, percentage on principal amount                                       1.01083% 102.17% 102.17%                      
Remaining principal balance due date                         Jun. 30, 2018                     Jul. 20, 2012                  
Call premium                                         2,500,000                        
Pre-tax interest changes (7,200,000) (7,200,000) (3,300,000)                                       3,300,000                    
Revolving credit facility, borrowings   501,400,000 113,300,000     25,000,000 107,400,000 80,000,000                                                  
Percentage of average interest rate             1.88% 1.88%                                                  
Percentage of average interest rate, during period             1.94% 1.94%                                                  
Percentage spread on LIBOR                                                             2.00% 1.50% 4.75%
Minimum fixed charge coverage ratio to be maintained                   1.0                                              
Outstanding borrowings under this revolving credit facility 99,500,000 99,500,000               0                                              
Available for borrowing                   125,000,000                                              
Aggregate letter of credit outstanding amount 15,000,000 15,000,000   7,300,000                                                          
Issuance of letter of credit                 10,000,000