Note 5 - Long-Term Debt and Credit Facility (Detail) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2011	Mar. 31, 2012	Sep. 30, 2012		Sep. 30, 2011	Jun. 30, 2014	Dec. 31, 2011	Nov. 30, 2011
Debt Instrument, Face Amount	$ 500,000,000
Line of Credit Facility, Maximum Borrowing Capacity	250,000,000
Line of Credit Facility, Term	5 years
Term Loan, Term	5 years
Business Acquisition, Cost of Acquired Entity, Cash Paid			189,736,000
Repayments of Long-term Debt	52,500,000		18,750,000		97,500,000
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				4,046,000
Debt Instrument, Interest Rate at Period End			2.61%
Notional Amount of Interest Rate Derivatives								83,000,000
Derivative, Amount of Hedged Item								83,000,000
Derivative, Fixed Interest Rate								0.89%
Derivative, Variable Interest Rate			2.47%
Line of Credit Facility, Increase, Additional Borrowings		26,000,000
Unsecured Debt			225,000,000				243,800,000
Line of Credit Facility, Amount Outstanding			26,000,000
Other Loans Payable			1,500,000				1,500,000
Due from Joint Ventures			4,100,000				8,000,000
Other Long-term Debt			5,300,000				4,100,000
Letters of Credit Outstanding, Amount			20,800,000
Long-term Debt, Fair Value			250,400,000				245,100,000
Credit Facility Maximum Consolidated Leverage Ratio			3.00			2.25
Credit Facility Actual Consolidated Leverage Ratio			2.07
Line of Credit Facility, Remaining Borrowing Capacity			86,000,000
Credit Facility Minimum Consolidated Fixed Charge Ratio			1.25
Credit Facility Actual Consolidated Fixed Charge Ratio			1.50
Minimum Net Worth Required for Compliance			520,700,000
Credit Facility Net Worth			681,800,000
Term Loan [Member]
Debt Instrument, Face Amount	250,000,000
Paid at Closing [Member] | Fyfe NA [Member]
Business Acquisition, Cost of Acquired Entity, Cash Paid	115,800,000
Agreed to Loan [Member]
Due from Joint Ventures			14,200,000
Payments to Fund Long-term Loans to Related Parties			6,200,000
Insurance Carriers Collateral [Member]
Letters of Credit Outstanding, Amount			9,900,000
Work Performance Obligations [Member]
Letters of Credit Outstanding, Amount			10,900,000
Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Fyfe NA [Member]
Business Acquisition, Cost of Acquired Entity, Cash Paid			118,118,000	[1]
Bayou Wasco [Member]
Due from Joint Ventures			$ 4,500,000
Net Worth Calculation One [Member]
Debt Instrument, Covenant Description			80%
Net Worth Calculation Two [Member]
Debt Instrument, Covenant Description			50%
Net Worth Calculation Three [Member]
Debt Instrument, Covenant Description			100%

[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.