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Share-Based Payments - Summary of RSU Information and Weighted Average Grant Date Fair Values Excluding Performance RSUs (Detail) - Restricted Stock Units (RSUs) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Unvested January 1 (in shares) 3,173 3,036 3,505
Granted (in shares) 2,332 1,786 1,116
Vested (in shares) (1,159) (1,426) (1,337)
Forfeited (in shares) (608) (223) (248)
Unvested December 31 (in shares) 3,738 3,173 3,036
Weighted Average Grant Date Fair Value      
Unvested January 1 (USD per share) $ 37.10 $ 34.94 $ 28.24
Granted (USD per share) 23.54 34.83 42.82
Vested (USD per share) 37.29 29.77 24.53
Forfeited (USD per share) 34.67 36.27 31.82
Unvested December 31 (USD per share) $ 28.98 $ 37.10 $ 34.94