XML 56 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1
Share-based payments - Schedule of Restricted Share Units and Restricted Stock Activity (Detail) - Restricted Stock Units and Restricted Stock [Member]
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of units, Beginning Balance | shares 12,407,029
Number of units, Granted | shares 2,732,000 [1]
Number of units, Vested and delivered | shares (2,357,852)
Number of units, Withheld as treasury stock | shares (192,288) [2]
Number of units, Vested not delivered | shares (1,660,001) [3]
Number of units, Forfeitures | shares (172,416)
Number of units, Ending Balance | shares 10,756,472
Weighted average grant-date fair value, Beginning Balance | $ / shares $ 8.40
Weighted average grant-date fair value, Beginning Balance, Granted | $ / shares 5.61 [1]
Weighted average grant-date fair value, Vested and delivered | $ / shares 6.58
Weighted average grant-date fair value, Withheld as treasury stock | $ / shares 6.86 [2]
Weighted average grant-date fair value, Vested not delivered | $ / shares 3.36 [3]
Weighted average grant-date fair value, Forfeitures | $ / shares 5.80
Weighted average grant-date fair value, Ending Balance | $ / shares $ 8.94
[1] 650,000 shares of restricted stock were granted during the nine months ended September 30, 2017, and 150,000 shares of restricted stock were unvested as of September 30, 2017.
[2] As discussed in Note 7, the increase in treasury stock was due to shares withheld to pay statutory withholding taxes upon the vesting of RSUs during the nine months ended September 30, 2017.
[3] Vested not delivered represent the vested RSUs with deferred delivery at a future time. As of September 30, 2017, the cumulative shares of RSUs included in “vested not delivered” above were 5,767,668.