Note 14 - Commitments and Contingencies (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Terms of Operating Lease	one to sixyears
Operating Leases, Rent Expense, Net	$ 26,500,000	$ 24,200,000	$ 25,400,000
Term Of Estimated Claims Expected To Be Paid	1 year
Loss Contingency, Estimate of Possible Loss	3,900,000	3,600,000
Guarantee Obligations Due to Closure of Bonds	8,600,000	8,600,000
Claims Insured By Third Party Insurers	225,000
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	1,200,000	1,200,000
Accrued Liabilities For Unsecured Portion Of Claims	3,100,000	3,200,000
Asset Retirement Obligation	2,700,000	2,100,000
General Liabilities [Member]
Claims Insured By Third Party Insurers	$ 750,000