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Quarterly Consolidated Financial Data (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Quarterly Financial Information [Line Items]                      
Operating revenues $ 62,570,000us-gaap_SalesRevenueServicesNet $ 54,166,000us-gaap_SalesRevenueServicesNet $ 76,766,000us-gaap_SalesRevenueServicesNet $ 68,181,000us-gaap_SalesRevenueServicesNet $ 69,673,000us-gaap_SalesRevenueServicesNet $ 75,647,000us-gaap_SalesRevenueServicesNet $ 83,350,000us-gaap_SalesRevenueServicesNet $ 76,629,000us-gaap_SalesRevenueServicesNet $ 261,683,000us-gaap_SalesRevenueServicesNet $ 305,299,000us-gaap_SalesRevenueServicesNet $ 319,274,000us-gaap_SalesRevenueServicesNet
(Loss) income from operations (6,531,000)us-gaap_OperatingIncomeLoss (9,228,000)us-gaap_OperatingIncomeLoss 2,822,000us-gaap_OperatingIncomeLoss (4,967,000)us-gaap_OperatingIncomeLoss (2,463,000)us-gaap_OperatingIncomeLoss 6,851,000us-gaap_OperatingIncomeLoss 10,598,000us-gaap_OperatingIncomeLoss 5,194,000us-gaap_OperatingIncomeLoss (17,904,000)us-gaap_OperatingIncomeLoss 20,180,000us-gaap_OperatingIncomeLoss 16,601,000us-gaap_OperatingIncomeLoss
Net (loss) income $ (3,882,000)us-gaap_NetIncomeLoss $ (7,493,000)us-gaap_NetIncomeLoss $ 1,652,000us-gaap_NetIncomeLoss $ (2,897,000)us-gaap_NetIncomeLoss $ (2,790,000)us-gaap_NetIncomeLoss $ 4,063,000us-gaap_NetIncomeLoss $ 6,279,000us-gaap_NetIncomeLoss $ 2,928,000us-gaap_NetIncomeLoss $ (12,620,000)us-gaap_NetIncomeLoss $ 10,480,000us-gaap_NetIncomeLoss $ 11,113,000us-gaap_NetIncomeLoss [1]
Basic (loss) income per share attributable to common stock $ (0.49)us-gaap_EarningsPerShareBasic $ (0.94)us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ (0.36)us-gaap_EarningsPerShareBasic $ (0.35)us-gaap_EarningsPerShareBasic $ 0.50us-gaap_EarningsPerShareBasic $ 0.78us-gaap_EarningsPerShareBasic $ 0.36us-gaap_EarningsPerShareBasic $ (1.59)us-gaap_EarningsPerShareBasic $ 1.31us-gaap_EarningsPerShareBasic $ 1.40us-gaap_EarningsPerShareBasic [1]
Diluted (loss) income per share attributable to common stock $ (0.49)us-gaap_EarningsPerShareDiluted $ (0.94)us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ (0.36)us-gaap_EarningsPerShareDiluted $ (0.35)us-gaap_EarningsPerShareDiluted $ 0.50us-gaap_EarningsPerShareDiluted $ 0.78us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ (1.59)us-gaap_EarningsPerShareDiluted $ 1.31us-gaap_EarningsPerShareDiluted $ 1.39us-gaap_EarningsPerShareDiluted [1]
[1] 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 the 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.