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Summary of Activity for Restricted Stock Awards (Detail)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of Shares  
Unvested at beginning of year | shares 6,930,306
Granted | shares 2,685,749
Vested | shares (2,051,414)
Canceled | shares (21,020)
Unvested at end of period | shares 7,543,621
Weighted Average Grant Date Fair Value  
Unvested at beginning of year | $ / shares $ 15.37
Granted | $ / shares 15.35
Vested | $ / shares 14.98
Canceled | $ / shares 15.58
Unvested at end of period | $ / shares $ 15.47