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Share-based payments - Schedule of Unvested Restricted Share Activity (Detail) - Restricted Stock Units [Member]
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of units, Beginning Balance | shares 13,721,000 [1]
Number of units, Granted | shares 743,639
Number of units, Vested and delivered | shares (379,737)
Number of units, Withheld as treasury stock | shares (61,685) [2]
Number of units, Vested not delivered | shares (1,437,667)
Number of units, Forfeitures | shares (123,500)
Number of units, Ending Balance | shares 12,462,050
Weighted average grant-date fair value, Beginning Balance | $ / shares $ 7.78 [1]
Weighted average grant-date fair value, Granted | $ / shares 4.87
Weighted average grant-date fair value, Vested and delivered | $ / shares 6.65
Weighted average grant-date fair value, Withheld as treasury stock | $ / shares 6.25 [2]
Weighted average grant-date fair value, Vested not delivered | $ / shares 1.54
Weighted average grant-date fair value, Forfeitures | $ / shares 6.95
Weighted average grant-date fair value, Ending Balance | $ / shares $ 8.38
[1] Among the total unvested balance as of December 31, 2015, 12,312,000 shares, with weighted average grant-date fair value of $9.48, were subsequently approved at the Company’s annual meeting of stockholders on June 3, 2016.
[2] As discussed in Note 8, 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, 2016.