Note 5 - Share-based Compensation (Detail) - Components of Share-based Compensation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pretax compensation expense	$ 29,715	$ 26,841	$ 21,397
Restricted Stock Units (RSUs) [Member]
Pretax compensation expense	24,393	24,192	19,190
Tax benefit	9,391	9,237	7,208
Expense, net of tax	15,002	14,955	11,982
Performance Shares [Member]
Pretax compensation expense	4,298	816
Tax benefit	1,655	312
Expense, net of tax	2,643	504
Stock Options [Member]
Pretax compensation expense	1,024	1,833	2,207
Tax benefit	394	700	829
Expense, net of tax	$ 630	$ 1,133	$ 1,378