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Properties and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jul. 31, 2008
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]        
Net proceeds received from sale-leaseback transactions $ 35.8us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities      
Deferred gain on sale-leaseback transactions 29.0us-gaap_SaleLeasebackTransactionDeferredGainGross 16.5us-gaap_SaleLeasebackTransactionDeferredGainGross 18.4us-gaap_SaleLeasebackTransactionDeferredGainGross  
Lease period for sale-leaseback transactions 15 years      
Rental expense   8.2us-gaap_LeaseAndRentalExpense 8.5us-gaap_LeaseAndRentalExpense 8.9us-gaap_LeaseAndRentalExpense
Minimum future rental commitments   48.7us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Minimum future rental commitments, year one   7.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Minimum future rental commitments, year two   7.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Minimum future rental commitments, year three   6.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Minimum future rental commitments, year four   5.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Minimum future rental commitments, year five   5.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Minimum future rental commitments, thereafter   17.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Other Current Liabilities [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gain on sale-leaseback transactions   $ 1.9us-gaap_SaleLeasebackTransactionDeferredGainGross
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
$ 1.9us-gaap_SaleLeasebackTransactionDeferredGainGross
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember