Note 10 - Leasing Activities (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leases, Rent Expense	$ 84,174,000	$ 69,620,000	$ 57,375,000
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	50,500,000
Operating Leases, Income Statement, Minimum Lease Revenue	86,300,000	68,300,000	53,400,000
Operating Leases, Income Statement, Contingent Revenue	13,800,000	10,600,000	7,500,000
Property Subject to or Available for Operating Lease, Net	327,400,000	229,300,000
Property Subject to or Available for Operating Lease, Accumulated Depreciation	115,600,000	97,400,000
Vehicles [Member]
Operating Leases, Rent Expense	2,800,000	2,800,000	3,800,000
Land and Building [Member] | Minimum [Member]
Monthly Rental Payment, Operating Lease	325
Land and Building [Member] | Maximum [Member]
Monthly Rental Payment, Operating Lease	60,000
Land and Building [Member]
Operating Leases, Rent Expense	6,800,000	5,700,000	4,600,000
Vehicle Leases As Lessee [Member] | Minimum [Member]
Lease Term	1 year
Lease Term	1 year
Lease Term	1 year
Lease Term	1 year
Vehicle Leases As Lessee [Member] | Maximum [Member]
Lease Term	10 years
Lease Term	10 years
Lease Term	10 years
Lease Term	10 years
Vehicle Leases As Lessor [Member] | Minimum [Member]
Lease Term	1 year
Lease Term	1 year
Lease Term	1 year
Lease Term	1 year
Vehicle Leases As Lessor [Member] | Maximum [Member]
Lease Term	10 years
Lease Term	10 years
Lease Term	10 years
Lease Term	10 years
Vehicle Leases As Lessee [Member]
Guaranteed Residual Value under Operating Lease Arrangements	5,000,000
Guaranteed Residual Value under Capital Lease Arrangements	$ 19,800,000