Commitments and Contingencies - Additional Information (Detail)	0 Months Ended	12 Months Ended
	Jun. 02, 2013 MBbls	Dec. 31, 2014 USD ($) Defendant	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 AUD	Mar. 12, 2014 USD ($)	Dec. 31, 2014 Alcoa [Member] AUD	Dec. 31, 2014 Oswal [Member] USD ($)	Dec. 31, 2014 Burrup Holdings Limited (Yara Pilbara Holdings Pty Limited ) [Member] USD ($)	Jan. 31, 2012 Burrup Holdings Limited (Yara Pilbara Holdings Pty Limited ) [Member]	Jan. 31, 2012 Yara International [Member]
Commitment And Contingencies [Line Items]
Accrued liability for legal contingencies		$ 8,000,000
Environmental tax and royalty obligations						100,000,000
Retain right of obligations		67,500,000
Number of defendants		100
Expected contractual general damages					100,000,000		158,000,000	491,000,000	166,000,000
Maximum expected contractual liquidated damages under long term contracts		20,000,000			5,700,000				13,000,000
Approximate percentage of natural gas volumes sold under long-term contracts that have liquidated damages provisions		90.00%
Percentage of combined ownership held by the plaintiff in the company		65.00%
Percentage of acquisition										49.00%	51.00%
Maximum cost considered to be recognized for additional reserve		300,000
Undiscounted reserve for environmental remediation		67,000,000
Quantity of water spill	97,000
Net rental expenses		58,000,000	53,000,000	49,000,000
Lease expiration		2035
Contractual obligation cost incurred		$ 96,000,000	$ 80,000,000	$ 71,000,000