Related-Party Transactions, Summary of Transactions (Details) (USD $)	12 Months Ended						0 Months Ended	3 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Jan. 23, 2013 Quarterly cash distribution	Dec. 31, 2012 Quarterly cash distribution
Related Party Transactions [Abstract]
Revenues	$ 142,667,000		$ 77,443,000		$ 19,477,000
Operating and maintenance expenses (b)	15,397,000	[1]	26,735,000	[1]	47,027,000	[1]
General and administrative expenses	12,624,000		8,165,000		3,968,000
Imbalance settlement gains	9,686,000		7,153,000		3,250,000
Operating lease expenses	400,000		200,000		400,000
Quarterly cash distributions paid to Tesoro	(27,100,000)		(9,600,000)
Distribution Made to Member or Limited Partner
Declaration date								Jan. 23, 2013
Cash distribution declared to Tesoro							0.4725
Cash distribution paid to Tesoro	$ 2,839,000		$ 597,000				$ 9,200,000
Date of distribution								Feb. 14, 2013

[1] Operating and maintenance expenses include imbalance settlement gains of $9.7 million, $7.2 million and $3.3 million in the years ended December 31, 2012, 2011 and 2010, respectively. It also includes operating lease expenses of $0.4 million, $0.2 million and $0.4 million in the years ended December 31, 2012, 2011 and 2010, respectively, related to our subleases from Tesoro of our Anchorage terminal and Martinez Crude Oil Marine Terminal.