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Operating Leases (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Total term of lease facility 30 years    
Initial term of lease facilities 15 years    
Number of additional extensions on lease facility 3gpi_Numberofadditionalextensionsonleasefacility    
Operating Leases (Textual) [Abstract]      
Extended period of lease under option 5 years    
Future, non-cancelable sublease payments $ 2.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals    
Total rent expense under all operating leases $ 58.9us-gaap_OperatingLeasesRentExpenseNet $ 59.7us-gaap_OperatingLeasesRentExpenseNet $ 50.4us-gaap_OperatingLeasesRentExpenseNet