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Summary of Activity for Restricted Stock Awards (Detail)
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Number of Shares  
Unvested at beginning of year | shares 6,930,306
Granted | shares 2,818,749
Vested | shares (2,193,074)
Canceled | shares (94,300)
Unvested at end of period | shares 7,461,681
Weighted Average Grant Date Fair Value  
Unvested at beginning of year | $ / shares $ 15.37
Granted | $ / shares 15.27
Vested | $ / shares 15.01
Canceled | $ / shares 15.67
Unvested at end of period | $ / shares $ 15.44