XML 23 R55.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Restricted Stock Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, Shares, Beginning Balance 1,817,745 1,478,000 1,235,505
Restricted stock, Shares, Granted 394,928 575,694 573,440
Restricted stock, Shares, Vested (429,034) (229,979) (318,350)
Restricted stock, Shares, Cancellations (11,975) (5,970) (12,595)
Restricted stock, Shares, Ending Balance 1,771,664 1,817,745 1,478,000
Restricted stock, Fair Market Value at Date of Grant, Beginning Balance $ 40,655 $ 30,600 $ 24,718
Restricted stock, Granted, Fair Market Value at Date of Grant 10,846 16,005 12,693
Restricted stock, Vested, Fair Market Value at Date of Grant (9,722) (5,816) (6,563)
Restricted stock, Cancellations, Fair Market Value at Date of Grant (257) (134) (248)
Restricted stock, Fair Market Value at Date of Grant, Ending Balance $ 41,522 $ 40,655 $ 30,600