XML 66 R100.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summarized Status of Nonvested Shares and Changes during Periods (Detail) (Unvested Restricted Awards, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Unvested Restricted Awards
     
Shares      
Outstanding at beginning of year 618,000 821,000 1,084,000
Granted 310,690 206,040 197,186
Vested (366,000) (376,000) (416,000)
Forfeited/canceled (9,000) (33,000) (44,000)
Outstanding at end of year 554,000 618,000 821,000
Weighted Average Grant-Date Fair Value      
Outstanding at beginning of year $ 16.80 $ 16.91 $ 18.60
Granted $ 21.47 $ 17.67 $ 15.55
Vested $ 15.91 $ 17.60 $ 20.63
Forfeited/canceled $ 19.85 $ 15.71 $ 17.32
Outstanding at end of year $ 19.96 $ 16.80 $ 16.91