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Equity Compensation Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2017
Aug. 31, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Aug. 05, 2014
Aug. 04, 2014
Performance-Based Restricted Stock Units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Grant of restricted stock 162,613 146,552            
Restricted shares, vesting term 3 years 3 years            
Closing price of common stock on grant date $ 5.66 $ 4.96            
Unrecognized stock compensation expense     $ 140   $ 140      
Compensation expense related to restricted stock grant     $ 4 $ 4 $ 12 $ 12    
Dividend equivalent rights, granted 0 0            
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 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                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Dividend equivalent right issued, term         5 years      
Dividend equivalent right issued     761,311   761,311      
Dividend equivalent rights outstanding     761,311   761,311      
Paid or accrued compensation related to dividend equivalent right issued     $ 70 98 $ 238 301    
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     $ 21 $ 21 $ 62 $ 62