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Total Capital and Net Income Per Unit - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 19, 2009 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 01, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common units awarded, Shares |  |  | 1,267 | 1,007 |
Days after year-end where limited partner's have right to receive cash distribution |  | 45 days |  |  |
Minimum percentage of holding by unitholders to remove general partner |  | 66.67% |  |  |
Minimum quarterly distribution of incentives per quarter |  | 0.4125 |  |  |
Subordinated units converted into common units | 3,700,000 |  |  |  | 7,400,000
Conversion price of subordinated unit | $ 17.66 |  |  |  | $ 29.95
Exceeded cash distribution per unit |  | 0.4625 |  |  |
Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common units awarded, Shares |  | 1,263 |  |  |
Common units awarded, Value |  | 50,000 |  |  |
Number of non employee directors received partnership awards |  | 4 | 4 | 4 |
Chairman [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common units awarded, Shares |  | 2,210 |  |  |
Common units awarded, Value |  | $ 87,500 |  |  |

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- Definition Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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