Intangible Assets by Major Class Subject to Amortization (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 19,423	$ 19,423
Accumulated Amortization	5,355	4,796
Net Book Value	14,068	14,627
Trade name
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years	10 years
Original Cost	1,900	1,900
Accumulated Amortization	302	254
Net Book Value	1,598	1,646
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years	5 years
Original Cost	1,500	1,500
Accumulated Amortization	439	364
Net Book Value	1,061	1,136
Below market lease
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years	5 years
Original Cost	900	900
Accumulated Amortization	370	325
Net Book Value	530	575
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years	10 years
Original Cost	13,000	13,000
Accumulated Amortization	2,121	1,796
Net Book Value	10,879	11,204
Order backlog
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	1 year	1 year
Original Cost	2,100	2,100
Accumulated Amortization	2,100	2,034
Net Book Value	0	66
Transition services agreement
Finite-Lived Intangible Assets [Line Items]
Original Cost	23	23
Accumulated Amortization	23	23
Net Book Value	$ 0	$ 0
Transition services agreement | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	1 year	1 year