Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Additional Information (Detail)

v3.8.0.1
Share-Based Payments - Additional Information (Detail) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Feb. 10, 2017
Mar. 31, 2017
Feb. 28, 2017
May 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense for vendors         $ 4,000,000 $ 19,100,000 $ 22,000,000 $ 24,200,000
Common stock shares issued on merger, value             87,923,000 $ 1,000,000
Shares issued for specified services   200,000            
Share issued for services, price per share   $ 11.34            
Cost of shares issued for specified services       $ 2,300,000        
Vendors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense for vendors         $ 0   $ 19,400,000  
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock shares issued on merger 90,350   409,800       51,540,000 500,000
Common stock shares issued on merger, value $ 1,300,000   $ 5,800,000       $ 1,390,000 $ 1,000
2016 Omnibus Compensation Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant   1,000,000            
Aggregate difference between purchase price and fair value   $ 11,400,000            
Purchase price per share   $ 0.50            
Closing share price on the date of issuance per share   $ 11.88