SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 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 month periods ended March 31, 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 March 31, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	209,967	$	51,810		$	160,096		$	149,448	$	701		$	572,022
Intersegment revenues, net	9,554		(4,293		)	(7,536		)	2,548		(273		)	—
Direct revenues	$	219,521	$	47,517		$	152,560		$	151,996	$	428		$	572,022

	For the Three Months Ended March 31, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	196,016	$	51,691		$	112,882		$	74,334	$	39		$	434,962
Intersegment revenues, net	3,346		(2,157		)	(3,479		)	2,800		(510		)	—
Direct revenues	$	199,362	$	49,534		$	109,403		$	77,134	$	(471	)	$	434,962

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 March 31,
	2012			2011
Adjusted EBITDA:
Technical Services	$	50,825		$	47,679
Field Services	2,304			3,989
Industrial Services	34,657			24,296
Oil and Gas Field Services	38,399			13,712
Corporate Items	(25,237		)	(22,085		)
Total	$	100,948		$	67,591
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,416		$	2,389
Depreciation and amortization	36,831			25,460
Income from operations	61,701			39,742
Other expense (income)	299			(2,899		)
Interest expense, net of interest income	11,272			6,478
Income before provision for income taxes	$	50,130		$	36,163

PP&E and intangible assets by segment

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

	March 31, 2012		December 31, 2011
Property, plant and equipment, net
Technical Services	$	307,005	$	308,118
Field Services	32,126		30,296
Industrial Services	264,923		254,469
Oil and Gas Field Services	268,521		267,987
Corporate Items	46,109		43,077
Total property, plant and equipment, net	$	918,684	$	903,947
Intangible assets:
Technical Services
Goodwill	$	44,452	$	44,410
Permits and other intangibles, net	80,983		81,605
Total Technical Services	125,435		126,015
Field Services
Goodwill	2,232		2,232
Permits and other intangibles, net	1,167		1,204
Total Field Services	3,399		3,436
Industrial Services
Goodwill	46,143		45,444
Permits and other intangibles, net	20,292		19,701
Total Industrial Services	66,435		65,145
Oil and Gas Field Services
Goodwill	32,896		30,306
Permits and other intangibles, net	36,525		37,134
Total Oil and Gas Field Services	69,421		67,440
Total	$	264,690	$	262,036

Total assets by segment

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

	March 31, 2012		December 31, 2011
Technical Services	$	601,864	$	604,904
Field Services	39,439		37,850
Industrial Services	350,142		345,202
Oil and Gas Field Services	425,991		429,938
Corporate Items	675,459		667,909
Total	$	2,092,895	$	2,085,803

Total assets by geographical area

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

	March 31, 2012		December 31, 2011
United States	$	1,105,994	$	1,119,491
Canada	986,901		961,936
Other foreign	—		4,376
Total	$	2,092,895	$	2,085,803