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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 0 Months Ended | |
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Sep. 30, 2013
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Oct. 31, 2012
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Oct. 07, 2013
Subsequent Event [Member]
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| Schedule Of Significant Accounting Policies [Line Items] | |||
| Initial Contribution to the joint venture | $ 10 | ||
| Additional Contribution to the joint venture | 8.3 | ||
| Gain on the sale of equity interest joint venture | 91 | ||
| Proceeds from sale of equity interest joint venture | $ 109.1 |
| X | ||||||||||
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- Definition
This item represents the initial contribution to joint venture pipelines and facilities construction. No definition available.
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- Details
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| X | ||||||||||
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- Definition
The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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