Note 11 - Share Based Compensation And Employee Benefit Plans (Detail) - Stock Option (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Outstanding Options, shares	4,037,266	3,848,472
Outstanding Options, weighted average exercise price (in Dollars per share)	$ 14.52	$ 12.48
Outstanding Options, weighted average remaining contractual life	6 years 47 days
Outstanding Options, aggregate intrinsic value (in Dollars)	$ 26,607,758
Expected to vest after December 31, 2012	2,276,753
Expected to vest after December 31, 2012 (in Dollars per share)	$ 16.42
Expected to vest after December 31, 2012	7 years 266 days
Expected to vest after December 31, 2012 (in Dollars)	11,383,235
Vested and exercisable at December 31, 2012	1,613,658
Vested and exercisable at December 31, 2012 (in Dollars per share)	$ 11.74
Vested and exercisable at December 31, 2012	3 years 9 months
Vested and exercisable at December 31, 2012 (in Dollars)	$ 14,413,812
Granted	636,320
Granted (in Dollars per share)	$ 23.48
Exercised	(426,976)
Exercised (in Dollars per share)	$ 9.51
Forfeited	(20,550)
Forfeited (in Dollars per share)	$ 14.83