BUSINESS COMBINATIONS (Details)	3 Months Ended								3 Months Ended
	Mar. 31, 2012 Other Acquisitions USD ($)		Dec. 31, 2011 Other Acquisitions USD ($)		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 ($)	Sep. 30, 2011 Other Acquisitions Industrial Services USD ($)	Mar. 31, 2012 Peak Energy Services Ltd.'s ('Peak') USD ($)		Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)		Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') CAD	Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') Oil and Gas Field Services USD ($)	Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') Industrial Services USD ($)	Dec. 31, 2011 Scenario, Previously Reported [Member] Other Acquisitions USD ($)		Jun. 10, 2011 Scenario, Previously Reported [Member] Peak Energy Services Ltd.'s ('Peak') USD ($)
Business Combinations
Fair value of consideration transferred			$ 142,134,000								$ 205,133,000		$ 205,100,000	200,200,000			$ 141,327,000		$ 205,133,000
Debt assumed in exchange of acquisition					(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
Net debt assumed					25,200,000									(37,500,000)
Total consideration for acquisition			142,134,000								205,133,000		205,100,000	200,200,000			141,327,000		205,133,000
Exchange rate translation														0.976057
Summary of Recognised Amounts of Identifiable Assets and Liabilities Assumed [Roll Forward]
Current assets	41,491,000	[1]															41,385,000	[2]	46,543,000	[2]
Current assets, Measurement Period Adjustments			106,000	[1]					(1,321,000)	[2]
Current assets, (As adjusted)			41,491,000	[1]							45,222,000	[2]					41,385,000	[2]	46,543,000	[2]
Property, plant and equipment	62,969,000																62,966,000		151,574,000
Property, plant and equipment, Measurement Period Adjustements			3,000						0
Property, plant and equipment, (As adjusted)			62,969,000								151,574,000						62,966,000		151,574,000
Identifiable intangible assets	23,371,000																23,371,000		13,186,000
Customer relationships and other intangibles, Measurement Period Adjustements			0						1,545,000
Identifiable intangible assets ( As adjusted)			23,371,000								14,731,000						23,371,000		13,186,000
Other assets	1,671,000																1,798,000		6,931,000
Other assets, Measurement Period Adjustements			(127,000)						709,000
Other assets (As adjusted)			1,671,000								7,640,000						1,798,000		6,931,000
Current liabilities	(22,117,000)																(22,561,000)		(29,036,000)
Current liabilities, Measurement Period Adjustements			444,000						23,000
Current liabilities (As adjusted)			(22,117,000)								(29,013,000)						(22,561,000)		(29,036,000)
Asset retirement obligations and remedial liabilities	(200,000)																(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)																(2,741,000)		(8,175,000)
Other liabilities, Measurement Period Adjustments			322,000						(1,902,000)
Other liabilities (As adjusted)			(2,419,000)								(10,077,000)						(2,741,000)		(8,175,000)
Total identifiable net assets			104,766,000								179,974,000						104,018,000		180,920,000
Total identifiable net assets, Measurement Period Adjustments			748,000						(946,000)
Total identifiable net assets			104,766,000								179,974,000						104,018,000		180,920,000
Goodwill	37,368,000	[3]				13,200,000	10,200,000	14,000,000							9,000,000	16,200,000	37,309,000	[3]	24,213,000	[3]
Goodwill, Measurement Period Adjustments			59,000	[3]					946,000	[3]
Goodwill (As adjusted)			37,368,000	[3]		13,200,000	10,200,000	14,000,000			25,159,000	[3]			9,000,000	16,200,000	37,309,000	[3]	24,213,000	[3]
Total	142,134,000		142,134,000										205,100,000	200,200,000			141,327,000		205,133,000
Total, Measurement Period Adjustments			807,000								0
Total (As adjusted)			142,134,000								205,133,000		205,100,000	200,200,000			141,327,000		205,133,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma combined Revenue	483,639,000								500,265,000
Pro forma combined net Income	$ 27,157,000								$ 30,872,000

[1] 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

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

[3] Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $9.0 million and $16.2 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectivel