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Fair Value Measurements - Fair Value Information Related to Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets | $ 17,969
Money Market Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets | 16,680
Other Mutual Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets | 1,289
Quoted Prices in Active Markets (Level 1) [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets | 17,969
Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets | 16,680
Quoted Prices in Active Markets (Level 1) [Member] | Other Mutual Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets | 1,289
Significant Other Observable Inputs (Level 2) [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets |
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets |
Significant Other Observable Inputs (Level 2) [Member] | Other Mutual Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets |
Significant Unobserved Inputs (Level 3) [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets |
Significant Unobserved Inputs (Level 3) [Member] | Money Market Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets |
Significant Unobserved Inputs (Level 3) [Member] | Other Mutual Funds [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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