Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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+ Details

TRANSACTIONS WITH RELATED PARTIES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Employee
Related Party Transaction [Line Items]
Transactions with related party, employee loans and advances	$ 0.1		$ 0.1		$ 0.1
Investee
Related Party Transaction [Line Items]
Transactions with related party, receivables	0.3		0.3		1.0
Transactions with related party, revenue	0.4	1.0	2.5	1.6
Affiliated Entity
Related Party Transaction [Line Items]
Transactions with related party, receivables	0.8		0.8		0.2
Transactions with related party, revenue	$ 1.9	$ 1.5	$ 3.5	$ 3.8
Anadarko Petroleum Corporation
Related Party Transaction [Line Items]
Percentage of sales out of total revenues	2.00%	6.00%	2.00%	4.00%
Percentage of receivables outstanding out of total accounts receivable	1.00%		1.00%		2.00%
Element Petroleum LP
Related Party Transaction [Line Items]
Percentage of sales out of total revenues	1.00%	1.00%	1.00%	1.00%
Percentage of receivables outstanding out of total accounts receivable	1.00%		1.00%		1.00%