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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net income $ 15,641 $ 10,913
Depreciation and amortization 28,197 26,526
Gain on sale of equipment (5,883) (2,380)
Stock based compensation 2,817 728
Deferred income taxes 5,971 3,640
Provision for doubtful accounts 2 10
Changes in assets and liabilities:    
Trade receivables 7,573 3,855
Income taxes (2,188) (4,033)
Tires in service 2,369 (477)
Prepaid expenses and other current assets (2,395) (116)
Other assets (2,373) (630)
Accounts payable and accrued expenses (2,063) 677
Net cash provided by operating activities 47,668 38,713
Cash flows from investing activities:    
Purchase of property and equipment (90,924) (64,141)
Proceeds on sale of property and equipment 69,669 44,012
Purchase of businesses, net of cash (32,578) (34,300)
Purchase of available for sale securities   (4,661)
Net cash used in investing activities (53,833) (59,090)
Cash flows from financing activities:    
Borrowings on long-term debt 29,345 34,531
Dividends paid (895) (445)
Principal payments under capital lease obligations (48,386) (37,215)
Proceeds from issuance of stock 215 34
Net cash used in financing activities (19,721) (3,095)
Effect of exchange rates on cash and cash equivalents 334 (783)
Decrease in cash and cash equivalents (25,552) (24,255)
Cash and cash equivalents at beginning of period 33,646 25,673
Cash and cash equivalents at end of period 8,094 1,418
Interest paid 2,664 2,864
Income taxes paid 5,596 7,193
Change in dividends payable   445
Lease obligation incurred in the purchase of equipment $ 26,415 $ 67,200