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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 6,566 $ 8,262
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 16,083 14,642
Gain on sale of equipment (1,157) (1,911)
Stock based compensation 545 537
Deferred income taxes (2,395) 2,341
Provision for doubtful accounts   3
Changes in assets and liabilities:    
Trade receivables 295 (590)
Income taxes 5,690 (127)
Tires in service 490 (174)
Prepaid expenses and other current assets (5,411) (4,989)
Other assets (261) 927
Accounts payable and accrued expenses (4,561) 935
Net cash provided by operating activities 15,884 19,856
Cash flows from investing activities:    
Purchase of property and equipment (19,758) (63,084)
Proceeds on sale of property and equipment 8,833 28,504
Purchase of businesses (9,284) (24,094)
Net cash used in investing activities (20,209) (58,674)
Cash flows from financing activities:    
Proceeds from borrowings on long-term debt 81,510 107,480
Payments on bank borrowing on long-term debt (69,882) (78,890)
Principal payments under capital lease obligations (6,476) (20,007)
Dividends paid (457) (448)
Proceeds from issuance of common stock 1,304 39
Net cash provided by financing activities 5,999 8,174
Effect of exchange rates on cash and cash equivalents 621 351
Increase (Decrease) in cash and cash equivalents 2,295 (30,293)
Cash and cash equivalents at beginning of period 1,315 33,646
Cash and cash equivalents at end of period 3,610 3,353
Supplemental disclosure of cash flow information:    
Interest paid 1,224 1,490
Income taxes paid 94 3,035
Lease obligation incurred in the purchase of equipment   $ 24,280