Note 5 - Long-Term Debt and Credit Facility (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended					1 Months Ended			12 Months Ended
	Aug. 31, 2011	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2012	Aug. 31, 2011 Paid at Closing [Member] Fyfe NA [Member]	Jan. 31, 2012 Agreed to Loan [Member]	Dec. 31, 2012 Insurance Carriers Collateral [Member]	Dec. 31, 2012 Work Performance Obligations [Member]	Dec. 31, 2010 Net Worth Calculation One [Member]	Dec. 31, 2010 Net Worth Calculation Two [Member]	Dec. 31, 2010 Net Worth Calculation Three [Member]	Aug. 31, 2011 Minimum [Member]	Aug. 31, 2011 Maximum [Member]	Aug. 31, 2011 Fyfe NA [Member]		Dec. 31, 2012 Bayou Wasco [Member]	Aug. 31, 2011 Credit Facility [Member]	Aug. 31, 2011 Term Loan [Member]
Debt Instrument, Face Amount																			$ 500,000,000	$ 250,000,000
Term Loan Term	5 years
Line of Credit Facility, Maximum Borrowing Capacity	250,000,000
Line of Credit Facility Term	5 years
Business Acquisition, Cost of Acquired Entity, Cash Paid			189,163,000				115,800,000									118,118,000	[1]
Repayments of Long-term Debt	52,500,000		25,000,000	103,750,000	10,000,000
Early Repayment of Senior Debt	65,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.54%
Make Whole Payment	5,700,000
Payments of Debt Issuance Costs	4,100,000
Debt Instrument, Basis Spread on Variable Rate														1.50%	2.50%
Debt Instrument, Interest Rate at Period End			2.56%
Notional Amount of Interest Rate Derivatives				83,000,000		83,000,000
Derivative, Amount of Hedged Item						83,000,000
Derivative, Basis Spread on Variable Rate						0.89%
Derivative, Variable Interest Rate				2.46%
Line of Credit Facility, Increase, Additional Borrowings		26,000,000
Unsecured Debt			218,750,000	243,750,000
Line of Credit Facility, Amount Outstanding			26,000,000
Other Loans Payable			100,000	1,500,000
Due from Joint Ventures			4,100,000	8,000,000				14,200,000										5,500,000
Payments to Fund Long-term Loans to Related Parties								6,200,000
Other Long-term Debt			5,200,000	4,100,000
Letters of Credit Outstanding, Amount			22,400,000						9,900,000	12,500,000
Long-term Debt, Fair Value			253,600,000	245,100,000
Credit Facility Maximum Consolidated Leverage Ratio			2.25	2.75
Credit Facility, Consolidated Leverage Ratio			1.99
Line of Credit Facility, Remaining Borrowing Capacity			97,000,000
Credit Facility Minimum Consolidated Fixed Charge Ratio			1.25
CreditFacilityFixed ChargeRatio			1.41
Debt Instrument, Covenant Description											80%	50%	100%
Minimum Net Worth Required for Compliance					520,700,000
Credit Facility, Net Worth			$ 699,300,000

[1] 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.