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Income Taxes Computed at Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	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 Taxes [Line Items]
Income (loss) before income taxes	$ (23,686)	$ (11,952)	$ 70,796	$ 14,669	$ (10,457)	$ (22,434)	$ 69,873	$ 5,583	$ 49,827	$ 42,565	$ 47,067
Provision for income taxes:
Tax at Federal statutory rate									17,440	14,898	16,473
Impact of Partnership income or loss not subject to federal income taxes									97	697	1,631
State taxes net of federal benefit									3,192	2,801	3,493
Permanent differences									37	28	54
Change in valuation allowance									(658)	(14)	672
Change in unrecognized tax benefit									55	(1,669)	189
Other									(242)	(165)	211
Income tax expense									$ 19,921	$ 16,576	$ 22,723

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