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Partnership Credit Facilities (Parenthetical) (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
6.625% Notes
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Dec. 31, 2012
6.625% Notes
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Dec. 31, 2011
6.625% Notes
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Aug. 20, 2009
6.625% Notes
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Dec. 31, 2013
5.875% Notes
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Dec. 31, 2012
5.875% Notes
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Dec. 31, 2011
5.875% Notes
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Sep. 15, 2010
5.875% Notes
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Dec. 31, 2013
4.750% Notes
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Dec. 31, 2012
4.750% Notes
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Aug. 17, 2012
4.750% Notes
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Dec. 31, 2013
6.25% Notes
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Dec. 31, 2012
6.25% Notes
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Aug. 17, 2012
6.25% Notes
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Dec. 31, 2013
Before Amendment
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Dec. 31, 2013
After Amendment
Revolving Credit Facility
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| Line of Credit Facility [Line Items] | ||||||||||||||||||||||||||||||
| Maturity Date | Aug. 15, 2019 | [1],[2] | Mar. 15, 2021 | [1],[3] | Feb. 15, 2023 | [1],[4] | Aug. 15, 2042 | [1],[4] | ||||||||||||||||||||||
| Revolving credit facility | $ 1,100,000,000 | |||||||||||||||||||||||||||||
| Revolving credit facility, final maturity date | Jul. 13, 2017 | |||||||||||||||||||||||||||||
| Borrowing Outstanding | 700,000 | |||||||||||||||||||||||||||||
| Senior notes issued | 600,000,000 | 600,000,000 | 600,000,000 | 400,000,000 | 400,000,000 | 400,000,000 | 400,000,000 | 250,000,000 | ||||||||||||||||||||||
| Notes acquired not retired | 15,000,000 | 15,000,000 | ||||||||||||||||||||||||||||
| Interest expense | $ 38,800,000 | $ 39,400,000 | $ 39,800,000 | $ 23,500,000 | $ 23,500,000 | $ 23,500,000 | $ 19,000,000 | $ 7,100,000 | $ 15,600,000 | $ 5,800,000 | ||||||||||||||||||||
| Maximum percentage of aggregate principal amount of the outstanding notes | 25.00% | |||||||||||||||||||||||||||||
| Percentage of repurchase of note on principal amount of notes | 101.00% | |||||||||||||||||||||||||||||
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