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Quarterly Results (Unaudited) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 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
Unaudited quarterly consolidated statement of operations                      
Revenue from operations $ 118,419 $ 126,965 $ 128,329 $ 121,948 $ 129,128 $ 124,199 $ 130,324 $ 122,205 $ 495,661 $ 505,856 $ 475,304
Income before provision for income taxes from operations 523 28,588 9,463 11,843 17,139 18,813 21,522 11,181 50,047 68,655 79,948
Net income (loss) from operations $ (707) $ 18,373 $ 5,631 $ 7,093 $ 10,409 $ 11,288 $ 12,698 $ 6,709 $ 30,390 $ 41,104 $ 48,296
Unaudited quarterly consolidated statement of operations                      
Basic earnings per common share (in dollars per share) $ (0.02) $ 0.59 $ 0.17 $ 0.22 $ 0.33 $ 0.36 $ 0.40 $ 0.21 $ 0.97 $ 1.30 $ 1.57
Diluted earnings per common share (in dollars per share) $ (0.02) $ 0.59 $ 0.17 $ 0.22 $ 0.32 $ 0.35 $ 0.39 $ 0.20 $ 0.97 $ 1.26 $ 1.47
Basic weighted average shares outstanding (in shares) 29,664,259 30,937,394 32,231,011 32,143,064 31,772,379 31,651,061 31,561,412 31,482,853 31,243,932 31,616,926 30,854,796
Diluted weighted average shares outstanding (in shares) 29,664,259 30,937,394 32,321,482 32,658,070 32,702,807 32,540,187 32,331,686 33,054,264 31,395,301 32,657,236 32,783,079