GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail) (USD $)	12 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Customer Relationships Bahamas Oil Refining Company International Limited Year acre	Sep. 30, 2011 Natural Gas Storage	Dec. 31, 2011 Natural Gas Storage
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill Impairment Test Fair Value Assumptions Weighted Average Cost Of Capital	100.00%
Amortization expense	$ 13,400,000	$ 4,500,000	$ 3,500,000
Amortization expense related to intangible assets for 2012	14,600,000
Amortization expense related to intangible assets for 2013	14,600,000
Amortization expense related to intangible assets for 2014	14,400,000
Amortization expense related to intangible assets for 2015	13,400,000
Amortization expense related to intangible assets for 2016	11,700,000
Goodwill impairment expense	$ 169,560,000				$ 169,600,000	$ 169,560,000
Estimated recovery period (in years)				20
Number of acres of leased seabed				330