SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Reconciliation of third party revenues to direct revenues

The following table reconciles third party revenues to direct revenues for the three- and six-month periods ended June 30, 2012 and 2011 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed.

	For the Three Months Ended June 30, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	229,502	$	62,553		$	149,642		$	81,091	$	330		$	523,118
Intersegment revenues, net	7,724		(3,485		)	(7,835		)	4,118		(522		)	—
Direct revenues	$	237,226	$	59,068		$	141,807		$	85,209	$	(192	)	$	523,118

	For the Three Months Ended June 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	215,747	$	59,505		$	115,013		$	56,673	$	297		$	447,235
Intersegment revenues, net	6,901		(5,461		)	(3,567		)	2,591		(464		)	—
Direct revenues	$	222,648	$	54,044		$	111,446		$	59,264	$	(167	)	$	447,235

	For the Six Months Ended June 30, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	439,469	$	114,363		$	309,738		$	230,539	$	1,031		$	1,095,140
Intersegment revenues, net	17,278		(7,778		)	(15,371		)	6,666		(795		)	—
Direct revenues	$	456,747	$	106,585		$	294,367		$	237,205	$	236		$	1,095,140

	For the Six Months Ended June 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	411,763	$	111,196		$	227,895		$	131,007	$	336		$	882,197
Intersegment revenues, net	10,247		(7,618		)	(7,046		)	5,391		(974		)	—
Direct revenues	$	422,010	$	103,578		$	220,849		$	136,398	$	(638	)	$	882,197

Reconciliation to consolidated statements of income to adjusted EBITDA

The following table presents information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, and other income to its segments.

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Adjusted EBITDA:
Technical Services	$	66,717		$	63,823		$	117,542		$	111,502
Field Services	7,588			8,220			9,892			12,209
Industrial Services	34,935			27,401			69,592			51,697
Oil and Gas Field Services	7,810			6,974			46,209			20,686
Corporate Items	(28,349		)	(25,191		)	(53,586		)	(47,276		)
Total	$	88,701		$	81,227		$	189,649		$	148,818
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,505		$	2,407		$	4,921		$	4,796
Depreciation and amortization	38,663			26,936			75,494			52,396
Income from operations	47,533			51,884			109,234			91,626
Other expense (income)	75			(2,868		)	374			(5,767		)
Interest expense, net of interest income	10,968			10,642			22,240			17,120
Income before provision for income taxes	$	36,490		$	44,110		$	86,620		$	80,273

PP&E and intangible assets by segment

The following table presents assets by reported segment and in the aggregate (in thousands):

	June 30, 2012		December 31, 2011
Property, plant and equipment, net
Technical Services	$	311,447	$	308,118
Field Services	34,643		30,296
Industrial Services	284,960		254,469
Oil and Gas Field Services	266,709		267,987
Corporate Items	57,281		43,077
Total property, plant and equipment, net	$	955,040	$	903,947
Intangible assets:
Technical Services
Goodwill	$	45,577	$	44,410
Permits and other intangibles, net	80,168		81,605
Total Technical Services	125,745		126,015
Field Services
Goodwill	2,232		2,232
Permits and other intangibles, net	1,127		1,204
Total Field Services	3,359		3,436
Industrial Services
Goodwill	51,976		45,444
Permits and other intangibles, net	24,296		19,701
Total Industrial Services	76,272		65,145
Oil and Gas Field Services
Goodwill	36,177		30,306
Permits and other intangibles, net	33,031		37,134
Total Oil and Gas Field Services	69,208		67,440
Total	$	274,584	$	262,036

Total assets by segment

The following table presents the total assets by reported segment (in thousands):

	June 30, 2012		December 31, 2011
Technical Services	$	604,781	$	604,904
Field Services	43,442		37,850
Industrial Services	394,180		345,202
Oil and Gas Field Services	371,338		429,938
Corporate Items	708,473		667,909
Total	$	2,122,214	$	2,085,803

Total assets by geographical area

The following table presents the total assets by geographical area (in thousands):

	June 30, 2012		December 31, 2011
United States	$	1,144,546	$	1,119,491
Canada	977,668		961,936
Other foreign	—		4,376
Total	$	2,122,214	$	2,085,803