BUSINESS COMBINATIONS (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2011 Peak Energy Services Ltd.'s ("Peak") USD ($)	Jun. 30, 2011 Peak Energy Services Ltd.'s ("Peak") USD ($)	Jun. 30, 2010 Peak Energy Services Ltd.'s ("Peak") USD ($)	Jun. 30, 2011 Peak Energy Services Ltd.'s ("Peak") USD ($)	Jun. 30, 2010 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. 30, 2011 Peak Energy Services Ltd.'s ("Peak") Industrial Services USD ($)	Jun. 30, 2011 Peak Energy Services Ltd.'s ("Peak") Oil and Gas Field Services USD ($)	Jun. 30, 2011 Badger Daylighting Ltd. ("Badger") USD ($)	Jan. 25, 2011 Badger Daylighting Ltd. ("Badger") CAD
Business Combinations
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
Debt assumed in exchange of acquisition						(38,431,000)	37,500,000
Total consideration for acquisition						205,100,000	200,200,000
Exchange rate translation							0.976057
Number of employees	900
Summary of consideration paid for Peak at the acquisition date
Cash paid for Peak common shares						162,585,000
Fair value of previously owned common shares						4,117,000
Peak, net debt assumed						38,431,000	(37,500,000)
Fair value of consideration transferred						205,100,000	200,200,000
Gain loss recognized in other income previously held as common shares	1,900,000
Fair value of common shares in acquiree						4,100,000
Cash assumed for repayment of outstanding Peak debt						15,700,000
Number of term loan facilities						3	3
Acquisition related costs		600,000		700,000
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
Current assets	45,797,000	45,797,000		45,797,000
Property, plant and equipment	149,344,000	149,344,000		149,344,000
Identifiable intangible assets	14,107,000	14,107,000		14,107,000
Other assets	8,800,000	8,800,000		8,800,000
Current liabilities	(27,717,000)	(27,717,000)		(27,717,000)
Other liabilities	(8,344,000)	(8,344,000)		(8,344,000)
Total identifiable net assets	181,987,000	181,987,000		181,987,000
Goodwill	23,146,000	23,146,000		23,146,000				13,800,000	9,300,000
Total	205,133,000	205,133,000		205,133,000
Customer receivables	33,400,000	33,400,000		33,400,000
Customer receivables, gross amount due	35,300,000	35,300,000		35,300,000
Revenues attributable to Peak, included in the Company's consolidated statements of income		9,600,000		9,600,000
Unaudited pro forma combined summary data
Pro forma combined revenues			494,359,000		881,916,000
Pro forma combined net income			56,488,000		69,148,000
Minimum affirmative percentage of acquiree shareholders vote required for approval of acquisition transaction (as a percent)											66.67%
Maximum amount of obligation of acquiree to reimburse the out of pocket expenses incurred											1,500,000
Reimbursement received from acquiree										$ 1,100,000