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Share-based compensation - Schedule of Restricted Share Units, Common Stock Grants and Restricted Stock Activity (Parenthetical) (Detail) - shares
3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Restricted Stock Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding shares withheld as treasury stock   1,225,085
Restricted Stock Units, Common Stock Grants and Restricted Stock [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share units, granted [1]   4,368,125
Share vested not delivered [2]   11,455,574
Shares vested but deferred in prior periods   6,273,318
Outstanding shares withheld as treasury stock [3]   872,562
Restricted Stock Units or Common Stock Grants [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Decrease in vested and unissued shares in prior period   3,761,068
Outstanding RSUs or common stock grants under vested not delivered   2,914,917
Spin-off Grants [Member] | Restricted Stock Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share units, granted   304,000
Share vested not delivered 304,000  
Spin-off Grants [Member] | Vested Subject to Deferred Delivery [Member] | Restricted Stock Units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share vested not delivered   2,041,000
[1] As discussed in “Spin-off of red violet” above, among the RSUs granted during the six months ended June 30, 2018, there were an aggregate of 304,000 shares of Spin-off Grants that vested and were delivered in the first quarter of 2018, and an aggregate of 2,041,000 shares of Transaction Grants that vested but were subject to deferred delivery over a three-year period.
[2] Among the shares vested and delivered during the six months ended June 30, 2018, there were 6,273,318 shares that were vested but deferred from prior periods. See (4) below.
[3] 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 first quarter of 2018. As of June 30, 2018, there were 1,225,085 outstanding shares withheld as treasury stock.