Partners' Capital - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Series F Preferred Units	Mar. 06, 2014 Series F Preferred Units	Jun. 30, 2014 Series F Preferred Units Minimum	Jun. 30, 2014 Series G Preferred Units	Mar. 31, 2014 Series G Preferred Units
Class of Stock [Line Items]
Depositary shares redeemed							50,000			25,000
Depositary share percentage per share							$ 0.01			$ 0.01
Dividend rate per share						6.236%			7.236%
Preferred stock, par value per shares							$ 0.01			$ 0.01
Redemption price per share							$ 1,000.00			$ 1,000.00
Dividend per share						$ 11.3299			$ 36.18
Total dividend						$ 566			$ 905
Cost associated with share redemption	0	3,546	1,462	3,546
Preferred stock shares authorized	10,000,000		10,000,000
Preferred stock, shares outstanding	0		0		750
Units converted into common stock			137,463	85,028
Conversion of limited partner units to general partner units			$ 1,333	$ 804
Fixed coupon rate of preferred stock								2.375%
Number of years of U.S treasury rate one						30 years
Number of years of U.S treasury rate two						10 years
LIBOR rate						3-month LIBOR
New coupon rate of preferred stock						6.275%