7% Series A Cumulative Redeemable Preferred Stock - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Mar. 26, 2019	Jan. 15, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Nov. 29, 2012
Class of Stock [Line Items]
Preferred stock, shares issued			22,876,901		22,876,901
Number of preferred stock owned by company			22,876,901		22,876,901
Preferred stock dividend paid			$ 0.0523	$ 0.0438	$ 0.1040	$ 0.0771
7% Series A Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued							43,821,901		97,032,848
Initial date for redemption of shares					Nov. 14, 2020
Preferred Stock, dividend rate					7.00%
Increase in dividend rate of preferred stock per annum, if not paid in cash for more than six quarters					7.00%
Increase in dividend rate of preferred stock if not redeemed after control events and May 14, 2018					11.00%
Increase in dividend rate, trigger date					May 14, 2018
Preferred stock initial liquidation preference per share			$ 1.90		$ 1.90		$ 1.90
Number of preferred stock owned by company							43,821,901
Accrued dividend				$ 1,200,000		$ 1,200,000		$ 2,300,000
7% Series A Cumulative Redeemable Preferred Stock [Member] | Minimum [Member]
Class of Stock [Line Items]
Legacy litigation and regulatory matters, expense					$ 3,500,000
7% Series A Cumulative Redeemable Preferred Stock [Member] | BRE Holdings [Member]
Class of Stock [Line Items]
Number of preferred stock owned by company			500,000		500,000		900,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock initial liquidation preference per share	$ 1.90
Series A Preferred Stock, dividends declared					$ 0.0523	$ 0.0523
Dividend paid, date		Jan. 01, 2019			Apr. 15, 2019	Jul. 15, 2019
Dividend payable, date declared					Mar. 25, 2019	Jul. 01, 2019
Dividends payable, date of record		Jan. 15, 2019			Apr. 01, 2019	Jul. 01, 2019
Preferred stock approved for redemption	20,945,000
Preferred stock approved for redemption per share	47.80%
Redemption price per share	$ 1.9099
Accumulated and unpaid dividends earned per share	$ 0.0099
Preferred stock approved for redemption value	$ 40,000,000
Preferred stock dividend paid		$ 0.0523