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Fair Values and Percentage of Partnership's Pension Plan Assets by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | $ 60,028 |
Percentage of the Partnership's pension plan assets | 100.00% |
Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 60,028 |
Significant Other Observable Inputs Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  |
Significant Unobservable Inputs Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  |
Corporate and U.S. government bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 47,364 | [1]
Percentage of the Partnership's pension plan assets | 79.00% | [1]
Corporate and U.S. government bond fund | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 47,364 | [1]
Corporate and U.S. government bond fund | Significant Other Observable Inputs Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  | [1]
Corporate and U.S. government bond fund | Significant Unobservable Inputs Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  | [1]
U.S. large-cap equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 9,123 | [1]
Percentage of the Partnership's pension plan assets | 15.00% | [1]
U.S. large-cap equity | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 9,123 | [1]
U.S. large-cap equity | Significant Other Observable Inputs Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  | [1]
U.S. large-cap equity | Significant Unobservable Inputs Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  | [1]
International equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 3,082 | [1]
Percentage of the Partnership's pension plan assets | 5.00% | [1]
International equity | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 3,082 | [1]
International equity | Significant Other Observable Inputs Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  | [1]
International equity | Significant Unobservable Inputs Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  | [1]
Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 459 |
Percentage of the Partnership's pension plan assets | 1.00% |
Cash | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets | 459 |
Cash | Significant Other Observable Inputs Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  |
Cash | Significant Unobservable Inputs Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of the Partnership's pension plan assets |  |
[1] | Represent investments in Vanguard funds that seek to replicate the asset category description.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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