Intangible Assets by Major Class Subject to Amortization (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 20,523	$ 20,523
Accumulated Amortization	7,417	6,872
Net Book Value	13,106	13,651
Trade name
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	10 years	10 years
Original Cost	2,000	2,000
Accumulated Amortization	496	446
Net Book Value	1,504	1,554
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	5 years	5 years
Original Cost	1,600	1,600
Accumulated Amortization	748	668
Net Book Value	852	932
Below market lease
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	5 years	5 years
Original Cost	900	900
Accumulated Amortization	550	505
Net Book Value	350	395
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	10 years	10 years
Original Cost	13,800	13,800
Accumulated Amortization	3,456	3,111
Net Book Value	10,344	10,689
Order backlog
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	1 year	1 year
Original Cost	2,200	2,200
Accumulated Amortization	2,144	2,119
Net Book Value	56	81
Transition services
Finite-Lived Intangible Assets [Line Items]
Original Cost	23	23
Accumulated Amortization	23	23
Net Book Value	$ 0	$ 0
Maximum | Transition services
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	1 year	1 year