Quarterly report pursuant to Section 13 or 15(d)

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

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Property and Equipment - Components of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Total, at cost $ 987,508 $ 844,652
Less accumulated depreciation (286,535) (249,528)
Property and equipment, net 700,973 595,124
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 185,371 142,730
Building and Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 541,026 476,846
Office Equipment and Fixtures [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 128,525 115,509
Parts and Service Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 69,325 62,678
Company Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost 8,159 7,750
Construction in Progress [Member]
    
Property, Plant and Equipment [Line Items]    
Total, at cost $ 55,102 $ 39,139