BUSINESS COMBINATIONS (Other 2012 Acquisitions) (Details) (Other 2012 Acquisitions [Member], USD $)	3 Months Ended	9 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Business Acquisition [Line Items]
Combined purchase price					$ 108,900,000
Assumption of long-term debt					7,700,000
Post-closing adjustment to purchase price					(2,100,000)
Purchase Price Allocation
Current assets					20,387,000	[1]
Property, plant and equipment					51,893,000
Customer relationships and other intangibles					21,769,000
Other assets					57,000
Current liabilities					(5,299,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities					(5,212,000)
Total identifiable net assets					83,595,000
Goodwill					25,264,000	[2]
Total					108,859,000
Other current assets, Measurement Period Adjustment		117,000	[1]
Property, plant and equipment, Measurement Period Adjustment		(8,000)
Permits and other intangibles, Measurement Period Adjustment		(1,000)
Other assets, Measurement Period Adjustment		4,000
Current liabilities, Measurement Period Adjustment		(22,000)
Other liabilities, Measurement Period Adjustments		(79,000)
Total identiiable net assets, Measurement Period Adjustments		11,000
Goodwill, Measurement Period Adjustments		1,308,000	[2]
Total, Measurement Period Adjustments		1,319,000
Preliminary fair value of customer receivables					13,200,000
Gross amounts of customer receivables					13,500,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma combined revenues	545,393,000			1,698,246,000
Pro forma combined net income	11,982,000			72,351,000
Acquisition-related costs		200,000
Scenario, Previously Reported [Member]
Purchase Price Allocation
Current assets					20,270,000	[1]
Property, plant and equipment					51,901,000
Customer relationships and other intangibles					21,770,000
Other assets					53,000
Current liabilities					(5,277,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities					(5,133,000)
Total identifiable net assets					83,584,000
Goodwill					23,956,000	[2]
Total					$ 107,540,000

[1] The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.

[2] Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.