Nature of Operations and Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified				1 Months Ended
	Sep. 17, 2012 Buses	Sep. 17, 2012 Buses Trademarks	Sep. 17, 2012 Buses Dealer Networks	Sep. 30, 2011 Minimum
Significant Accounting Policies [Line Items]
Percentage used to determine whether it is more likely than not that a reporting unit's fair value is less than its carrying amount				50.00%
Cash paid for acquisition	$ 3,914
Business acquisition allocated to inventory	915
Business acquisition allocated to property and equipment	331
Business acquisition allocated to goodwill	768
Business acquisition allocated to amortizing intangible asset		$ 1,000	$ 900