Reorganization Expenses Incurred by Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Reorganization expenses	$ 32,057
Pipelines & Terminals
Restructuring Cost and Reserve [Line Items]
Reorganization expenses	28,862
Natural Gas Storage
Restructuring Cost and Reserve [Line Items]
Reorganization expenses	495
Energy Services
Restructuring Cost and Reserve [Line Items]
Reorganization expenses	1,207
Development & Logistics
Restructuring Cost and Reserve [Line Items]
Reorganization expenses	$ 1,493