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Share-based payments - Schedule of Unvested Restricted Share Activity (Detail) - Restricted Stock Units [Member]
 3 Months Ended
Mar. 31, 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, Vested and delivered | shares (332,542)
Number of units, Withheld as treasury stock | shares (55,212) [2]
Number of units, Vested not delivered | shares (22,667)
Number of units, Forfeitures | shares (19,000)
Number of units, Ending Balance | shares 13,291,579 [1]
Weighted average grant-date fair value, Beginning Balance | $ / shares $ 7.35 [1]
Weighted average grant-date fair value, Vested and delivered | $ / shares 6.50
Weighted average grant-date fair value, Withheld as treasury stock | $ / shares 6.50 [2]
Weighted average grant-date fair value, Vested not delivered | $ / shares 6.50
Weighted average grant-date fair value, Forfeitures | $ / shares 7.01
Weighted average grant-date fair value, Ending Balance | $ / shares $ 7.38 [1]
[1] Among the total unvested balance as of March 31, 2016 and December 31, 2015, 12,312,000 shares, with weighted average grant-date fair value of $9.48, are subject to the Stockholder Approval. Among such shares, 3,000,000 shares were granted to Frost Gamma, and were vested fully on the grant date, and the remaining shares have a vesting period ranging from three to four years. For accounting purposes, the grant date was determined to be in 2015, as the Company concluded the Stockholder Approval was perfunctory.
[2] As mentioned in Note 10, the increase in treasury stock was due to shares withheld to pay statutory withholding taxes upon the