Annual report pursuant to Section 13 and 15(d)

Summary of Current Financial Performance Thresholds and Vesting Rates (Detail)

v3.19.3.a.u2
Summary of Current Financial Performance Thresholds and Vesting Rates (Detail) - Restricted Stock Units (RSUs)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold IRR 6.00% 6.00% 6.00%
Target IRR 8.00% 8.00% 8.00%
Maximum IRR 14.00% 14.00% 14.00%
Threshold IRR      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Shares Vesting 33.30%    
Targeted IRR      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Shares Vesting 66.60%    
Maximum IRR      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Shares Vesting 100.00%