Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.10.0.1
Share-Based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense for vested shares employees and directors | $ $ 1,100,000 $ 2,400,000
Unrecognized compensation expense | $ $ 199,700,000 $ 199,700,000
Antidilutive securities excluded from computation of loss per share amount   2,000,000
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense for vested shares employees and directors | $   $ 0
Number of awards to vest   900,000
Share-based payments (in shares)   24,200,000
2016 Omnibus Compensation Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of common stock authorized for issuance 40,000,000 40,000,000
Vesting period one | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of awards to vest   19,800,000
Vesting period two | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of awards to vest   3,500,000