PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension and Other Postretirement Benefits Disclosure [Line Items]
Retirement income guarantee plan ("RIGP")	a defined benefit plan that generally guarantees employees hired before January 1, 1986 a retirement benefit based on years of service and the employee’s highest compensation for any consecutive 5-year period during the last 10 years of service or other compensation measures as defined under the respective plan provisions.
Retirement income guarantee plan ("RIGP"), date employees must be hired before to qualify for retirement benefits	Jan. 01, 1986
Retirement income guarantee plan ("RIGP"), basis for retirement benefit, consecutive period of employee's highest compensation	5 years
Retirement income guarantee plan ("RIGP"), basis for retirement benefit, service period	10 years
Expected contribution to benefit plans in 2012	$ 6,100,000
Bahamas Oil Refining Company International Limited | Defined Contribution Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, total costs	600,000
Bahamas Oil Refining Company International Limited | Defined Contribution Pension | Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, employer contribution percentage	6.00%
Bahamas Oil Refining Company International Limited | Defined Contribution Pension | Minimum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, employer contribution percentage	3.00%
RIGP
Pension and Other Postretirement Benefits Disclosure [Line Items]
Recognized settlement that resulted in lump sum benefit payments	1,375,000		14,000,000
Retiree Medical Plan
Pension and Other Postretirement Benefits Disclosure [Line Items]
Recorded curtailment in the Retiree Medical Plan			1,100,000
Assumed annual rate of increase in per capita cost of covered health care benefits	8.00%
Assumed annual rate of increase in per capita cost of covered health care benefits, decreasing period	2021
Assumed annual rate of increase in per capita cost of covered health care benefits, 2021 and thereafter	4.50%
Retirement and Savings Plan | UNITED STATES
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, total costs	8,500,000	6,000,000	7,100,000
Retirement and Savings Plan | UNITED STATES | Retirement and Savings Plan, first component
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, services company contribution	5.00%
Retirement and Savings Plan | UNITED STATES | Retirement and Savings Plan, second component
Pension and Other Postretirement Benefits Disclosure [Line Items]
Services company matching contribution for all employees not participating in the ESOP	100.00%
Defined Benefit Plan, services company contribution	5.00%
Retirement and Savings Plan | UNITED STATES | Retirement and Savings Plan, second component, employee over 20 years of service
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, services company contribution	6.00%
Defined Benefit Plan, active employee years in service	20 years
Retirement and Savings Plan | BAHAMAS
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, total costs	700,000
Retirement and Savings Plan | BAHAMAS | Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, services company contribution	12.00%
Defined Benefit Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Multi-employer benefit plan	300,000	300,000	300,000
Defined Benefit Postretirement Health Coverage
Pension and Other Postretirement Benefits Disclosure [Line Items]
Multi-employer benefit plan	$ 200,000	$ 300,000	$ 200,000