Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.8.0.1
Share-Based Compensation - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based compensation expense for vested shares employees and directors | $ $ 1.3
Unrecognized compensation expense | $ $ 197.3
Antidilutive securities excluded from computation of earnings 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 | $ $ 0.0
Number of awards to vest 700,000
Share-based payments (in shares) 23,900,000
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
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 3,400,000