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Equity Compensation Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2016
Oct. 31, 2006
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Aug. 05, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Paid or accrued compensation related to dividend equivalent right issued     $ 104 $ 101 $ 207 $ 202  
Performance-Based Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Issuance of stock (in shares) 146,552            
Restricted shares, vesting term 3 years            
Closing price of common stock on grant date $ 4.96            
Unrecognized stock compensation expense     $ 185   $ 185    
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            
Performance-Based Restricted Stock Units | Involuntary Termination              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted shares, vesting term 3 years            
Minimum | Performance-Based Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Percentage of total return to stockholders 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
Issuance of stock (in shares)         0    
Termination date of restricted stock         Jan. 03, 2017    
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   3,500,000    
Grant of restricted stock   197,362          
Effective date for grant of restricted stock   Oct. 18, 2006          
Stock price on grant date   $ 9.12          
Restricted shares, vesting term   3 years          
Compensation expense related to restricted stock grant       79 $ 20 158  
Anworth Mortgage Asset Corporation 2004 Equity Plan | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Annually compounded rate of return on common stock, including dividends, effective date of the grant to each of the next three anniversary dates   12.00%          
Anworth Mortgage Asset Corporation 2007 Dividend Equivalent Rights Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Paid or accrued compensation related to dividend equivalent right issued     $ 104 $ 101 $ 207 $ 202