PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Rates Used to Estimate Net Periodic Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	5.40%	5.90%
United States Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.00%	3.00%	3.00%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%	5.00%	5.20%
United States Other Postretirement Benefit Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.00%	3.00%	3.00%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.90%	5.30%	6.10%
Canadian Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.25%	3.25%	3.25%
Canadian Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%	5.20%	6.00%
Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.50%
Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	9.00%	9.50%	9.50%
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	3.50%	4.75%	4.75%
Pension
Defined Benefit Plan Disclosure [Line Items]
Election of lump sum distributions (U.S. salaried and nonqualified plans only)	60.00%	65.00%	72.00%
Fiscal Year 2010 | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			1.75%
Fiscal Year 2010 | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			1.75%
Fiscal Year 2011 | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%
Fiscal Year 2011 | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%
Fiscal Year 2011 | Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%
Fiscal Year 2012 | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	2.00%
Fiscal Year 2012 | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	2.10%
Fiscal Year 2012 | Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	2.10%
Thereafter | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.50%	3.50%	3.50%
Thereafter | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.50%	3.50%	3.50%
Thereafter | Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.50%	3.50%