Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Stock-based Compensation - Summary of Time-Based Restricted Share Awards' Activity (Detail) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Beginning Balance (in shares) 1,624,519 2,090,803 1,360,947
Granted (in shares) 913,077 1,238,226 1,747,501
Vested (in shares) (1,077,102) (1,101,143) (712,434)
Forfeited/cancelled (in shares) (391,788) (603,367) (305,211)
Ending Balance (in shares) 1,068,706 1,624,519 2,090,803
Weighted-Average price      
Beginning of Period (in dollars per share) $ 20.01 $ 22.10 $ 21.58
Granted (in dollars per share) 19.84 17.69 22.09
Vested (in dollars per share) 19.78 21.18 21.30
Forfeited/cancelled (in dollars per share) 18.65 20.36 21.58
Ending of Period (in dollars per share) $ 20.05 $ 20.01 $ 22.10