Prepaid and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Prepaid insurance	$ 12,028	$ 8,865
Insurance receivables related to environmental expenditures	12,724	8,886
Ammonia receivable	1,288	1,295
Margin deposits	9,871	18,833
Prepaid services	8,661	24,359
Unbilled revenue	10,090	3,263
Tax receivable	1,610	120
Prepaid taxes	1,677	5,417
Vendor prepaid	14,903	2,657
Other	19,875	11,994
Total prepaid and other current assets	$ 92,727	$ 85,689

The carrying amount as of the balance sheet date of receivables related to ammonia sales

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