Partners' Capital - Dividend Distributions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Class of Stock [Line Items]
Distributions Per Unit	$ 0.085	$ 0.00	$ 0.17	$ 0.00
Total Distribution			$ 9,660
General Partner/Limited Partner Units [Member]
Class of Stock [Line Items]
Distributions Per Unit			$ 0.17
Total Distribution			19,286
Series F Preferred Units [Member]
Class of Stock [Line Items]
Distribution Per Unit			$ 2,725.32
Total Distribution			1,363
Series G Preferred Units [Member]
Class of Stock [Line Items]
Distribution Per Unit			$ 3,618.00
Total Distribution			905
Series J Preferred Units [Member]
Class of Stock [Line Items]
Distribution Per Unit			$ 5,085.12
Total Distribution			2,034
Series K Preferred Units [Member]
Class of Stock [Line Items]
Distribution Per Unit			$ 9,062.60
Total Distribution			$ 1,812