Annual report pursuant to Section 13 and 15(d)

Summary of Time-Based Restricted Share Awards' Activity (Detail)

v2.4.0.8
Summary of Time-Based Restricted Share Awards' Activity (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock
     
Number of Shares      
Beginning Balance 1,360,947 998,958 321,700
Granted 1,747,501 1,022,609 1,063,085
Vested (712,434) (426,675) (197,990)
Forfeited/cancelled (305,211) (233,945) (187,837)
Ending Balance 2,090,803 1,360,947 998,958
Weighted-Average price      
Beginning of Period $ 21.58 $ 24.54 $ 20.54
Granted $ 22.09 $ 19.93 $ 23.92
Vested $ 21.30 $ 23.08 $ 21.48
Forfeited/cancelled $ 21.58 $ 23.34 $ 21.60
Ending of Period $ 22.10 $ 21.58 $ 24.54