Non-Redeemable Preferred Stock - Additional Information (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Series B Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares outstanding	20,000	20,000
Number of cumulative convertible preferred stock	20,000	20,000
Preferred stock cumulative dividend rate	12.00%	12.00%
Cash dividends paid on non-redeemable preferred stock per share	$ 12.00
Preferred stock, par value	$ 100	$ 100
Number of shares of common stock for each share of converted preferred stock	33.3333 shares of common stock for each share of preferred stock
Preferred stock converted into shares of common stock	666,666
Votes per share for preferred share holder	One vote per share
Shares of authorized additional preferred stock	230,000
Series D Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares outstanding	1,000,000	1,000,000
Number of cumulative convertible preferred stock	1,000,000	1,000,000
Preferred stock cumulative dividend rate	6.00%	6.00%
Cash dividends paid on non-redeemable preferred stock per share	$ 0.06
Number of shares of common stock for each share of converted preferred stock	1 share of common stock for 4 shares of preferred stock
Preferred stock converted into shares of common stock	250,000
Votes per share for preferred share holder	.875 votes per share
Preferred stock no par value
Liquidation preference of Series D preferred stock	$ 1.00
Shares of authorized additional preferred stock	3,860,000