Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of Unrecognized Tax Benefits [Line Items]
Unrecognized Tax Benefits - Beginning of Year		$ 1,274	$ 1,246
Additions for tax positions of prior years			28
Reductions for tax positions of prior years	(1,070)	(1,070)
Lapse of statute of limitations
Unrecognized Tax Benefits - End of Year		$ 204	$ 1,274