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Senior Notes - Additional Information (Detail) (USD $) | Sep. 30, 2014 May 2008 senior notes | Sep. 30, 2013 May 2008 senior notes | May 07, 2008 May 2008 senior notes Contract | Sep. 30, 2014 July 2010 senior notes | Sep. 30, 2013 July 2010 senior notes | Jul. 14, 2010 July 2010 senior notes Contract
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Debt Disclosure [Line Items] |  |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors | $ 202,000,000 | $ 210,000,000 | $ 275,000,000 | $ 245,000,000 | $ 245,000,000 | $ 245,000,000
Number of series of Senior Notes issued |  |  | 4 |  |  | 4
Senior Notes issued in a private placement to a group of institutional investors, annual principal payment | $ 8,000,000 |  |  |  |  |

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