Note 1 - General (Detail) (USD $)	3 Months Ended			6 Months Ended														6 Months Ended		12 Months Ended	18 Months Ended						3 Months Ended			1 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Apr. 30, 2011 Bayou Wasco [Member]	Apr. 30, 2011 WCU [Member]	Jun. 30, 2011 Corrpower [Member]	Jun. 30, 2012 CRTS [Member]	Jun. 30, 2011 CRTS [Member]	Aug. 31, 2011 Hockway [Member] Paid at Closing [Member]	Jun. 30, 2012 Hockway [Member]		Aug. 31, 2011 Hockway [Member]	Oct. 31, 2011 UPS-Aptec Limited [Member]	Mar. 31, 2012 USTS [Member]	Aug. 31, 2011 Fyfe NA [Member] Paid at Closing [Member]	Jun. 30, 2012 Fyfe NA [Member]		Dec. 31, 2011 Fyfe NA [Member]	Jun. 30, 2012 Fyfe NA [Member]		Aug. 31, 2011 Fyfe NA [Member]	Jan. 04, 2012 Fyfe LA [Member] Paid at Closing [Member]	Mar. 31, 2012 Fyfe LA [Member] Earnout 1 [Member]	Mar. 31, 2012 Fyfe LA [Member] Earnout 2 [Member]	Mar. 31, 2012 Fyfe LA [Member]	Jun. 30, 2012 Fyfe LA [Member]		Apr. 30, 2012 Fyfe Asia [Member]	Jun. 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	$ 189,736,000			$ 189,736,000					$ 24,000,000	$ 24,000,000	$ 4,600,000	$ 3,552,000	[1]				$ 115,800,000	$ 118,118,000	[2]		$ 118,118,000	[2]		$ 2,300,000				$ 3,349,000	[3]		$ 40,717,000	$ 40,700,000
Business Acquisition, Contingent Consideration, Potential Cash Payment										15,000,000				1,500,000													800,000
Exclusive Negotiating Right, Period																							1
Payments for Previous Acquisition				532,000														500,000		1,800,000	2,300,000						1,100,000
Business Acquisition, Contingent Consideration, at Fair Value	17,034,000			17,034,000					14,760,000			1,454,000													100,000	700,000		820,000
Number of Joint Ventures																																2
Line of Credit Facility, Increase, Additional Borrowings		26,000,000																												18,000,000
Business Combination, Acquisition Related Costs (in Dollars)	1,412,000		326,000	1,987,000	326,000
Business Acquisition, Contingent Consideration, Potential Cash Payment, Period	3			3
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	0			0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 17,300,000			$ 17,300,000

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

[2] Includes the cash purchase price at closing of $115.8 million plus a final 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 to the sellers during the first quarter of 2012 based on a preliminary working capital adjustment.