Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.7.0.1
Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total grant date fair value     $ 21,165    
Share-based compensation expense for vested shares employees and directors $ 400 $ 1,600 $ 18,000 $ 5,100  
Settlement of Bonuses Accrued at December 31, 2016 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense for vested shares employees and directors         $ 2,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value per share $ 11.85        
Final Investment Decision ("FID Awards") [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total grant date fair value $ 19,300        
2016 Omnibus Compensation Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of common stock authorized for issuance 40,000,000   40,000,000    
Maximum number of common shares granted to an employee     10,000,000    
2016 Omnibus Compensation Incentive Plan [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted     5,500,000    
2016 Omnibus Incentive Plan ("Legacy Plan") [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted     14,900,000