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Equity Compensation Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 24, 2007
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 05, 2014
Aug. 04, 2014
Restricted Stock Units (RSUs)              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Issuance of stock (in shares)   8,000          
Compensation expense related to restricted stock grant   $ 78 $ 98 $ 82      
Performance-Based Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Issuance of stock (in shares)       162,613 146,552    
Restricted shares, vesting term       3 years 3 years    
Closing price of common stock on grant date       $ 5.66 $ 4.96    
Performance-Based Restricted Stock Units | Return to Capital Exceeds 10%              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted shares, vesting term       10 years 10 years    
Performance-Based Restricted Stock Units | Involuntary Termination              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted shares, vesting term       3 years 3 years    
Performance-Based Restricted Stock Units | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Percentage of total return to stockholders       10.00% 10.00%    
Anworth Mortgage Asset Corporation 2014 Equity Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Maximum authorized shares of common stock under grant of stock options and other stock-based awards           2,000,000  
Anworth Mortgage Asset Corporation 2014 Equity Plan | Restricted Stock Units (RSUs) | Independent Directors              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grant of restricted stock   8,000          
Anworth Mortgage Asset Corporation 2014 Equity Plan | DER | Independent Directors              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grant of restricted stock   8,000          
Anworth Mortgage Asset Corporation 2004 Equity Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Maximum authorized shares of common stock under grant of stock options and other stock-based awards             3,500,000
Anworth Mortgage Asset Corporation 2007 Dividend Equivalent Rights Plan | DER              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Dividend equivalent right issued, term 10 years 5 years          
Dividend equivalent right issued   746,611          
Dividend equivalent rights, granted   114,178          
Dividend equivalent rights outstanding   746,611          
Paid or accrued compensation related to dividend equivalent right issued   $ 301 $ 392 $ 430      
2017 Award Grants | Performance-Based Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Unrecognized stock compensation expense   136          
Compensation expense related to restricted stock grant   16          
2016 Award Grants | Performance-Based Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense related to restricted stock grant   $ 62