PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS, Additional Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments	$ 0	$ 19,047
Components of net periodic pension cost and weighted-average assumptions used to determine net cost [Abstract]
Service cost	13,754	12,402
Interest cost	32,990	34,114
Curtailment gain recognized			12,000
Settlement loss recognized		8,700
Assumed health care cost trend rates for next fiscal year	7.30%
Ultimate health care cost trend rates	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	345
Effect of one-percentage-point decrease on total service and interest cost components for the year	(289)
Effect of one-percentage-point increase on postretirement benefit obligation at year-end	3,092
Effect of one-percentage-point decrease on postretirement benefit obligation at year-end	(2,726)
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 benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments	0	19,047
Components of net periodic pension cost and weighted-average assumptions used to determine net cost [Abstract]
Service cost	12,309	10,742	11,882
Interest cost	29,984	30,613	31,359
Expected return on plan assets	(38,305)	(36,958)	(34,008)
Recognized actuarial loss	28,454	25,504	21,515
Amortization of prior service cost	(4,736)	(4,647)	(6,001)
Curtailment gain recognized	0	0	(12,014)
Settlement loss recognized	0	8,742	0
Special termination benefit recognized	0	0	104
Net periodic pension cost	27,706	33,996	12,837
Less: Discontinued operations	0	(402)	6,598
Continuing operations	27,706	33,594	19,435
Discount rate	4.16%	4.58%	5.36%
Expected return on plan assets	8.00%	8.00%	8.00%
Rate of compensation increase	4.15%	4.15%	4.15%
Other benefits [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	1,445	1,660	2,011
Interest cost	3,006	3,501	4,122
Recognized actuarial loss	0	0	233
Amortization of transition obligation	0	475	600
Amortization of prior service cost	(147)	(147)	(185)
Curtailment gain recognized	0	0	102
Special termination benefit recognized	0	0	396
Net periodic pension cost	4,304	5,489	7,279
Less: Discontinued operations	0	0	(1,618)
Continuing operations	$ 4,304	$ 5,489	$ 5,661
Discount rate	3.89%	4.46%	5.14%