Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Components of Property and Equipment, Net (Detail)

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Property and Equipment - Components of Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total, at cost $ 1,076,886 $ 1,006,147
Less accumulated depreciation (328,635) (300,035)
Subtotal 748,251 706,112
Less assets held for sale (6,170) (4,101)
Property and equipment, net 742,081 702,011
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 212,945 194,639
Building and Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 573,329 569,619
Office Equipment and Fixtures [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 138,887 135,221
Parts and Service Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 72,614 70,950
Company Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 7,986 8,002
Construction in Progress [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost $ 71,125 $ 27,716