Reconciliation of Basic and Diluted Earnings (Loss) Per Share Attributable to Common Stock (Detail) (USD $)	3 Months Ended												12 Months Ended
	Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2011
Income Per Common Share [Line Items]
Net income (loss)	$ (2,790,000)	[1]	$ 4,063,000	[1]	$ 6,279,000	$ 2,928,000	$ 1,152,000	[1]	$ 1,141,000	[1]	$ 5,589,000	$ 3,231,000	$ 10,480,000	$ 11,113,000	[2]	$ (3,246,000)
Income allocable to unvested restricted stock													(136,000)	(158,000)	[2]
Basic income (loss) attributable to common stock													10,344,000	10,955,000	[2]	(3,246,000)
Reallocation of participating earnings													1,000
Diluted income (loss) attributable to common stock													$ 10,345,000	$ 10,955,000	[2]	$ (3,246,000)
Weighted average common shares outstanding:
Basic:													7,879,614	7,841,722	[2]	7,809,561
Dilutive common stock options and restricted stock units													40,751	35,385	[2]
Diluted:													7,920,365	7,877,107	[2]	7,809,561
Basic income (loss) attributable to a share of common stock	$ (0.35)	[1]	$ 0.50	[1]	$ 0.78	$ 0.36	$ 0.14	[1]	$ 0.14	[1]	$ 0.71	$ 0.41	$ 1.31	$ 1.40	[2]	$ (0.42)
Diluted income (loss) attributable to a share of common stock	$ (0.35)	[1]	$ 0.50	[1]	$ 0.78	$ 0.36	$ 0.14	[1]	$ 0.14	[1]	$ 0.70	$ 0.41	$ 1.31	$ 1.39	[2]	$ (0.42)

[1] The June 30, 2012 and September 30, 2012 earnings per share calculations have been adjusted for the two-class method to reflect restricted shares that were not reflected as participating in the prior period. Basic earnings per share as previously reported for the quarters ended June 30, 2012 and September 30, 2012 were both $0.15. Diluted earnings per share as previously reported for the quarter ended September 30, 2012 was $0.15. The impact on all prior period financial statements is deemed immaterial.

[2] The 2012 earnings per share calculations have been adjusted for the two-class method to reflect restricted shares that were not reflected as participating in the prior period. Basic earnings per share as previously reported for year ended September 30, 2012 was $1.42. Diluted earnings per share as previously reported for the year-ended September 30, 2012 was $1.40. Basic weighted average shares outstanding as previously reported for the year ended September 30, 2012 was 7,841,722. Diluted weighted average shares outstanding as previously reported for the year ended September 30, 2012 was 7,931,593. The impact on all prior period financial statements is deemed immaterial.