BUSINESS COMBINATIONS (Details)	3 Months Ended			6 Months Ended					3 Months Ended			6 Months Ended
	Jun. 30, 2012 Other Acquisitions USD ($)		Jun. 30, 2011 Other Acquisitions USD ($)	Jun. 30, 2011 Other Acquisitions USD ($)	Sep. 30, 2011 Other Acquisitions USD ($)	Sep. 30, 2011 Other Acquisitions Oil and Gas Field Services USD ($)	Sep. 30, 2011 Other Acquisitions Technical Services [Member] USD ($)	Sep. 30, 2011 Other Acquisitions Industrial Services USD ($)	Jun. 30, 2012 Peak Energy Services Ltd.'s ('Peak') USD ($)		Jun. 30, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)	Jun. 30, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') CAD	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') Oil and Gas Field Services USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') Industrial Services USD ($)	Mar. 31, 2012 Scenario, Previously Reported [Member] Other Acquisitions USD ($)		Mar. 31, 2012 Scenario, Previously Reported [Member] Peak Energy Services Ltd.'s ('Peak') USD ($)
Business Combinations
Business Combination, Consideration Transferred					$ 142,100,000								$ 205,100,000	200,200,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred					(25,200,000)									37,500,000
Estimated net amount due to the sellers for working capital adjustments					(4,500,000)
Business Combination, Acquired Receivables, Fair Value					21,400,000								33,300,000
Customer receivables, gross amount due					22,100,000								34,700,000
Outstanding common shares acquired (as a percent)													100.00%	100.00%
Percentage of outstanding common shares of acquiree already owned by company (as a percent)													3.15%	3.15%
Cash paid in exchange for acquisition													158,700,000
Cash paid per share in exchange for acquisition (in dollars per share)													$ 0.95
Exchange rate translation														0.976057
Summary of Recognised Amounts of Identifiable Assets and Liabilities Assumed [Roll Forward]
Current assets																	41,491,000	[1]	45,222,000	[1]
Current assets, Measurement Period Adjustments	0	[2]							0	[1]
Current assets, (As adjusted)	41,491,000	[2]							45,222,000	[1]							41,491,000	[1]	45,222,000	[1]
Property, plant and equipment																	62,969,000		151,574,000
Property, plant and equipment, Measurement Period Adjustements	0								0
Property, plant and equipment, (As adjusted)	62,969,000								151,574,000								62,969,000		151,574,000
Identifiable intangible assets																	23,371,000		14,731,000
Customer relationships and other intangibles, Measurement Period Adjustements	0								(2,394,000)
Identifiable intangible assets ( As adjusted)	23,371,000								12,337,000								23,371,000		14,731,000
Other assets																	1,671,000		7,640,000
Other assets, Measurement Period Adjustements	0								369,000
Other assets (As adjusted)	1,671,000								8,009,000								1,671,000		7,640,000
Current liabilities																	(22,117,000)		(29,013,000)
Current liabilities, Measurement Period Adjustements	(1,286,000)								228,000
Current liabilities (As adjusted)	(23,403,000)								(28,785,000)								(22,117,000)		(29,013,000)
Asset retirement obligations and remedial liabilities																	(200,000)		(103,000)
Asset retirement obligations and remedial liabilities, Measurement Period Adjustments	0								0
Asset retirement obligations and remedial liabilities (As adjusted)	(200,000)								(103,000)								(200,000)		(103,000)
Other liabilities																	(2,419,000)		(10,077,000)
Other liabilities, Measurement Period Adjustments	0								(1,264,000)
Other liabilities (As adjusted)	(2,419,000)								(11,341,000)								(2,419,000)		(10,077,000)
Total identifiable net assets	103,480,000								176,913,000								104,766,000		179,974,000
Total identifiable net assets, Measurement Period Adjustments	(1,286,000)								(3,061,000)
Total identifiable net assets	103,480,000								176,913,000								104,766,000		179,974,000
Goodwill						13,300,000	11,400,000	14,000,000							12,900,000	15,300,000	37,368,000	[3]	25,159,000	[3]
Goodwill, Measurement Period Adjustments	1,286,000	[3]							3,061,000	[3]
Goodwill (As adjusted)	38,654,000	[3]				13,300,000	11,400,000	14,000,000	28,220,000	[3]					12,900,000	15,300,000	37,368,000	[3]	25,159,000	[3]
Total																	142,134,000		205,133,000
Total, Measurement Period Adjustments	0								0
Total (As adjusted)	142,134,000								205,133,000								142,134,000		205,133,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma combined Revenue			483,164,000	965,633,000							476,738,000	977,430,000
Pro forma combined net Income			$ 30,093,000	$ 57,063,000							$ 22,698,000	$ 53,738,000

[1] The fair value of the financial assets acquired includes customer receivables with a fair value of $33.3 million. The gross amount due was

[2] The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million

[3] Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectivel