DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Commodity Derivative Activity Recorded in Statement of Consolidated Operations (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Oil and Gas Production Revenues [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) reclassified from accumulated other comprehensive income (loss)into operations (effective portion)	$ 83	$ 11	$ 202	$ (36)
Revenues And Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivatives recognized in operations (ineffective portion and basis)	$ 1	$ 15	$ 1	$ 16