Note 1 - General (Detail) (USD $)	3 Months Ended										3 Months Ended		3 Months Ended						3 Months Ended	12 Months Ended	15 Months Ended			3 Months Ended				1 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Paid at Closing [Member] Hockway [Member]	Aug. 31, 2011 Paid at Closing [Member] Hockway [Member]	Aug. 31, 2011 Paid at Closing [Member] Fyfe NA [Member]	Jan. 04, 2012 Paid at Closing [Member] Fyfe LA [Member]	Mar. 31, 2012 Earnout 1 [Member] Fyfe LA [Member]	Mar. 31, 2012 Earnout 2 [Member] Fyfe LA [Member]	Apr. 30, 2011 Bayou Wasco [Member]	Apr. 30, 2011 WCU [Member]	Jun. 30, 2011 Corrpower [Member]	Mar. 31, 2012 CRTS [Member]	Jun. 30, 2011 CRTS [Member]	Mar. 31, 2012 Hockway [Member]	Aug. 31, 2011 Hockway [Member]		Oct. 31, 2011 UPS-Aptec Limited [Member]	Oct. 21, 2011 UPS-Aptec Limited [Member]	Dec. 31, 2011 USTS [Member]	Mar. 31, 2012 Fyfe NA [Member]	Dec. 31, 2011 Fyfe NA [Member]	Mar. 31, 2012 Fyfe NA [Member]	Aug. 31, 2011 Fyfe NA [Member]		Mar. 31, 2012 Fyfe LA [Member]	Mar. 31, 2012 Fyfe LA [Member]	Jan. 04, 2012 Fyfe LA [Member]		Apr. 30, 2012 Fyfe Asia [Member]	Apr. 05, 2012 Fyfe Asia [Member]
Noncontrolling Interest, Ownership Percentage by Parent								51.00%		70.00%						51.00%		51.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									49.00%	30.00%						49.00%		49.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid	$ 149,019,000	$ 4,600,000	$ 4,600,000	$ 115,800,000	$ 2,300,000							$ 24,000,000		$ 3,552,000	[1]							$ 118,118,000	[2]			$ 3,349,000	[3]
Business Acquisition, Contingent Consideration, Potential Cash Payment												15,000,000		1,500,000										800,000	800,000
Joint Venture Contract Value1																	67,300,000
Joint Venture Contract Miles of Pipeline																	135
Business Acquisition, Cost of Acquired Entity, Purchase Price																						115,800,000				2,300,000			40,700,000
Exclusive Negotiating Right, Period																						1
Payments for Previous Acquisition	532,000																		500,000	1,800,000	2,300,000			1,100,000	1,100,000
Business Acquisition, Contingent Consideration, at Fair Value	17,034,000					100,000	700,000				14,800,000	14,760,000	1,500,000	1,454,000										800,000	800,000	820,000
Line of Credit Facility, Increase, Additional Borrowings	26,000,000																											18,000,000
Business Combination, Acquisition Related Costs (in Dollars)	575,000
Business Acquisition, Contingent Consideration, Potential Cash Payment, Period	3
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	17,300,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual											6,700,000		700,000						14,300,000					300,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual											1,200,000		(100,000)						1,000,000					(100,000)
Proceeds from Previous Acquisition	$ 1,048,000												$ 1,000,000

[1] Includes the cash purchase price at closing of $4.6 million plus a final working capital adjustment of $1.0 million, which was returned to the Company in the first quarter of 2012.

[2] Includes the cash purchase price at closing of $115.8 million plus a preliminary working capital adjustment to the sellers of $2.3 million, of which $1.8 million was paid in 2011 and $0.5 million was paid in 2012.

[3] Includes the cash purchase price at closing of $2.3 million and an additional $1.1 million payment during the first quarter of 2012 based on a preliminary working capital adjustment to the sellers.