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Properties and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2008
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]        
Net proceeds received from sale-leaseback transactions $ 35.8      
Deferred gain on sale-leaseback transactions $ 29.0 $ 12.6 $ 14.5  
Lease period for sale-leaseback transactions 15 years      
Rental expense   8.3 7.2 $ 6.6
Minimum future rental commitments   40.8    
Minimum future rental commitments, year one   8.2    
Minimum future rental commitments, year two   7.4    
Minimum future rental commitments, year three   6.1    
Minimum future rental commitments, year four   5.6    
Minimum future rental commitments, year five   5.1    
Minimum future rental commitments, thereafter   8.4    
Other Current Liabilities [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gain on sale-leaseback transactions   $ 1.9 $ 1.9