PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS, Additional Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments	$ (19,047)	$ 0
Components of net periodic pension cost and weighted-average assumptions used to determine net cost [Abstract]
Service cost	12,402	13,893
Interest cost	34,114	35,481
Settlement loss recognized	8,700
Special termination benefit recognized	0	500
Assumed health care cost trend rates for next fiscal year (in hundredths)	8.10%
Ultimate health care cost trend rates (in hundredths)	4.50%
Effect of one-percentage-point change in assumed health care cost trend rates [Abstract]
Effect of one-percentage-point increase on total service and interest cost components for the year	410
Effect of one-percentage-point decrease on total service and interest cost components for the year	(351)
Effect of one-percentage-point increase on postretirement benefit obligation at year-end	4,983
Effect of one-percentage-point decrease on postretirement benefit obligation at year-end	(4,276)
Target rate of return of pension plan investments above inflation rate (in hundredths)	3.00%
LeTourneau RIP [Member]
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments	19,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments	(19,047)	0
Components of net periodic pension cost and weighted-average assumptions used to determine net cost [Abstract]
Service cost	10,742	11,882	14,411
Interest cost	30,613	31,359	30,713
Expected return on plan assets	(36,958)	(34,008)	(30,640)
Recognized actuarial loss	25,504	21,515	19,393
Amortization of prior service cost	(4,647)	(6,001)	(6,677)
Curtailment (gain) loss recognized	0	(12,014)	0
Settlement loss recognized	8,742	0	0
Special termination benefit recognized	0	104	0
Total net pension and postretirement benefit cost	33,996	12,837	27,200
Less: Discontinued operations	(402)	6,598	(12,765)
Total net pension and postretirement costs from Continuing operations	33,594	19,435	14,435
Discount rate (in hundredths)	4.58%	5.36%	5.97%
Expected return on plan assets (in hundredths)	8.00%	8.00%	8.00%
Rate of compensation increase (in hundredths)	4.15%	4.15%	4.15%
Other Postretirement Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments	0	0
Components of net periodic pension cost and weighted-average assumptions used to determine net cost [Abstract]
Service cost	1,660	2,011	1,955
Interest cost	3,501	4,122	4,284
Recognized actuarial loss	0	233	64
Amortization of transition obligation	475	600	662
Amortization of prior service cost	(147)	(185)	(204)
Curtailment (gain) loss recognized	0	102	0
Special termination benefit recognized	0	396	0
Total net pension and postretirement benefit cost	5,489	7,279	6,761
Less: Discontinued operations	0	(1,618)	(2,390)
Total net pension and postretirement costs from Continuing operations	$ 5,489	$ 5,661	$ 4,371
Discount rate (in hundredths)	4.46%	5.14%	5.83%