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
Jun. 30, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Total, at cost $ 1,178,836 $ 1,115,936
Less accumulated depreciation (349,138) (316,617)
Property and equipment, net 829,698 799,319
Land [Member]    
Property Plant And Equipment [Line Items]    
Total, at cost 244,004 224,124
Building and Improvements [Member]    
Property Plant And Equipment [Line Items]    
Total, at cost 632,443 582,261
Office Equipment and Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Total, at cost 174,083 151,165
Parts and Service Equipment [Member]    
Property Plant And Equipment [Line Items]    
Total, at cost 73,806 68,248
Company Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Total, at cost 8,997 8,958
Construction in Progress [Member]    
Property Plant And Equipment [Line Items]    
Total, at cost $ 45,503 $ 81,180