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Subsequent events (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended		1 Months Ended	2 Months Ended	1 Months Ended
	Jan. 23, 2012	Jan. 21, 2011	Apr. 24, 2012	Apr. 21, 2011	Jun. 30, 2012	Jun. 30, 2011	Jul. 23, 2012 Common Unitholders	Aug. 15, 2012 Common Unitholders	Jul. 23, 2012 Class B Unitholders	Aug. 10, 2012 Class B Unitholders
Dividend declared					$ 0.465	$ 0.465	$ 0.2325		$ 0.26736
Dividend paid	$ 0.2325	$ 0.2325	$ 0.2325	$ 0.2325				$ 0.2325		$ 0.26736

X

- Definition

Per-share or per-unit cash distributions declared to a common shareholder or unit-holder by an LLC or LP.

+ References

No definition available.

+ Details

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X

- Definition

Per-share or per-unit cash distributions paid to a common shareholder or unit-holder by an LLC or LP.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
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