Related Party Transactions (Details) (USD $)		3 Months Ended		1 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended			3 Months Ended
	Dec. 31, 2012	Mar. 31, 2013 Affiliate of General Partner	Mar. 31, 2012 Affiliate of General Partner	Jan. 31, 2011 Affiliate of General Partner Terminals item	Dec. 31, 2012 Affiliate of General Partner Cash collection and disbursement arrangement	Jan. 31, 2011 Affiliate of General Partner Services and Offtake agreement	Mar. 31, 2013 Affiliate of General Partner Leases	Mar. 31, 2012 Affiliate of General Partner Leases	Jan. 31, 2011 Affiliate of General Partner Leases Terminals	Jan. 31, 2013 Affiliate of General Partner Leases Ammonia assets item	Jan. 31, 2011 Affiliate of General Partner Leases Rail cars	Mar. 31, 2013 CF Industries Services and Offtake agreement	Mar. 31, 2012 CF Industries Services and Offtake agreement
Related party transactions
Term of agreement										5 years	1 year
Extended term of agreement						1 year				5 years	1 year
Payroll, payroll-related expenses and other employee related benefits		$ 5,600,000	$ 4,900,000
Allocated expenses												3,800,000	3,700,000
Demand deposits with affiliates of the General Partner	5,400,000				5,400,000
Due to affiliates, net		105,000,000
Cash distribution due to affiliates that was not paid		101,300,000
Number of terminals leased				2
Base quarterly rent of leased asset									109,000	100,000
Quarterly rent per leased asset (in dollars per car)											3,600
Rental income received							$ 100,000	$ 100,000
Number of times lease term is automatically extended under agreement										3