Non-Redeemable Preferred Stock - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Preferred Stock [Line Items]
Cash dividends paid on non-redeemable preferred stock	$ 300,000us-gaap_DividendsPreferredStockCash	$ 300,000us-gaap_DividendsPreferredStockCash	$ 300,000us-gaap_DividendsPreferredStockCash
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 shares' annual cumulative dividends	12.00%	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
Cash dividends paid on non-redeemable preferred stock	240,000	240,000	240,000
Cash dividends paid on non-redeemable preferred stock per share	$ 12.00
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 shares' annual cumulative dividends	6.00%	6.00%
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	$ 0	$ 0
Liquidation preference of Series D preferred stock	$ 1
Cash dividends paid on non-redeemable preferred stock	60,000	60,000	60,000
Cash dividends paid on non-redeemable preferred stock per share	$ 0.06
Shares of authorized additional preferred stock	4,000,000
Non-Redeemable Preferred Stock [Member]
Preferred Stock [Line Items]
Dividends in arrears	$ 0

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Number of shares issued for each share of convertible preferred stock that is converted.

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Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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Aggregate amount of cumulative preferred dividends in arrears.

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Aggregate number of nonredeemable preferred shares reserved for future issuance.

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The percentage rate used to calculate dividend payments on preferred stock.

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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Description of voting rights of nonredeemable preferred stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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