Related Party Transactions (Details) (USD $)			3 Months Ended		9 Months Ended		1 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Affiliate of General Partner	Sep. 30, 2011 Affiliate of General Partner	Sep. 30, 2012 Affiliate of General Partner	Sep. 30, 2011 Affiliate of General Partner	Jan. 31, 2011 Affiliate of General Partner Terminals item	Sep. 30, 2012 Affiliate of General Partner Cash collection and disbursement arrangement	Dec. 31, 2011 Affiliate of General Partner Cash collection and disbursement arrangement	Jan. 31, 2011 Affiliate of General Partner Services and Offtake agreement	Sep. 30, 2012 Affiliate of General Partner Leases	Sep. 30, 2011 Affiliate of General Partner Leases	Sep. 30, 2012 Affiliate of General Partner Leases	Sep. 30, 2011 Affiliate of General Partner Leases	Jan. 31, 2011 Affiliate of General Partner Leases Terminals	Sep. 30, 2012 Affiliate of General Partner Leases Terminals	Jan. 31, 2011 Affiliate of General Partner Leases Rail cars USDperunit	Sep. 30, 2012 CF Industries Services and Offtake agreement	Sep. 30, 2011 CF Industries Services and Offtake agreement	Sep. 30, 2012 CF Industries Services and Offtake agreement	Sep. 30, 2011 CF Industries Services and Offtake agreement
Related party transactions
Revenue recognized from sale of product inventory										$ 15,300,000
Term of agreement										1 year					1 year		1 year
Extended term of agreement										1 year					1 year		1 year
Payroll, payroll-related expenses and other employee related benefits			5,500,000	4,900,000	16,100,000	14,500,000
Allocated expenses																		3,800,000	3,700,000	11,300,000	10,700,000
Due to affiliates	3,000,000							3,000,000
Demand deposit with affiliates		8,600,000							8,600,000
Number of terminals leased							2
Base quarterly rent of leased asset															109,000
Decreased base quarterly rent of leased asset																100,000
Quarterly rent per leased asset (in dollars per car)																	3,600
Rental income received											$ 100,000	$ 100,000	$ 500,000	$ 500,000