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Share-based compensation - Schedule of Restricted Share Units, Common Stock Grants and Restricted Stock Activity (Detail)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Restricted Stock Units, Common Stock Grants and Restricted Stock  
Number of units  
Beginning balance (in shares) 3,831,965
Granted (in shares) 1,835,930
Vested and delivered (in shares) (1,456,902)
Withheld as treasury stock (in shares) (552,291)
Vested not delivered (in shares) 95,915
Forfeitures (in shares) (153,961)
Ending balance (in shares) 3,600,656
Weighted average grant-date fair value  
Beginning balance (in usd per share) | $ / shares $ 7.95
Granted (in usd per share) | $ / shares 4.89
Vested and delivered (in usd per share) | $ / shares 4.03
Withheld as treasury stock (in usd per share) | $ / shares 4.18
Vested not delivered (in usd per share) | $ / shares 4.78
Forfeitures (in usd per share) | $ / shares 3.54
Ending balance (in usd per share) | $ / shares $ 7.76
Outstanding shares vested and not delivered (in shares) 2,814,002
Restricted Stock Units and Restricted Stock  
Number of units  
Withheld as treasury stock (in shares) (1,785,489)
Restricted Stock Units or Common Stock Grants  
Weighted average grant-date fair value  
Decrease in vested and unissued shares in prior period (in shares) 95,915
Restricted Stock Units or Common Stock Grants | Spin-off Grants  
Number of units  
Vested and delivered (in shares) (740,334)