General form of registration statement for all companies including face-amount certificate companies

Temporary Equity and Stockholders' Equity - Summary of Accumulated but Unpaid Preferred Dividends (Detail)

v3.21.2
Temporary Equity and Stockholders' Equity - Summary of Accumulated but Unpaid Preferred Dividends (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]                
Distributed $ (7,897) $ (7,532) $ (7,393) $ (7,139) $ (6,701) $ (6,652) $ (26,900) $ (21,647)
Series A Preferred Stock [Member]                
Class of Stock [Line Items]                
Beginning balance 39,812 37,298 34,812 30,041 27,826 25,610 25,610 17,520
Accumulated 2,656 2,514 2,486 2,385 2,215 2,216 9,202 8,090
Distributed (42,468) 0 0 0 0 0 0 0
Ending balance 0 39,812 37,298 32,426 30,041 27,826 34,812 25,610
Series A One Preferred Stock [Member]                
Class of Stock [Line Items]                
Beginning balance 23,969 21,274 18,608 13,512 11,153 8,794 8,794 226
Accumulated 2,880 2,695 2,666 2,548 2,359 2,359 9,814 8,568
Distributed (26,849) 0 0 0 0 0 0 0
Ending balance 0 23,969 21,274 16,060 13,512 11,153 18,608 8,794
Series B Preferred Stock [Member]                
Class of Stock [Line Items]                
Beginning balance 38,474 36,151 33,910 29,495 27,391 25,338 25,338 17,594
Accumulated 2,361 2,323 2,241 2,180 2,104 2,053 8,572 7,744
Distributed (40,835) 0 0 0 0 0 0 0
Ending balance $ 0 $ 38,474 $ 36,151 $ 31,675 $ 29,495 $ 27,391 $ 33,910 $ 25,338