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Securities Financing Including Redeemable Preferred Stocks - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class Of Stock [Line Items] |  |  |  |
Common stock issued | 31,283,210 | 31,280,685 |  |
Rights agreement expiration period | 2018-12 |  |  |
Series E Redeemable Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Liquidation preference per share | $ 1,000 |  |  |
Redeemable preferred stock, redemption term | The letter agreement also provided for the amendment of certain other terms relating to the Series E Redeemable Preferred, including an increase in the per annum dividend rate payable in respect of the Series E Redeemable Preferred (a) by 0.50% on the third anniversary of the Financing Transaction, (b) by an additional 0.50% on the fourth anniversary of the Financing Transaction and (c) by an additional 1.0% on the fifth anniversary of the Financing Transaction. |  |  |
Preferred stock, shares authorized | 139,768 |  |  |
Preferred stock cumulative dividend rate | 14.00% |  |  |
Participating right in dividends and liquidating distributions expressed in number of common shares | 303,646 |  |  |
Minimum percentage of stock holding required | 10.00% |  |  |
Series E Redeemable Preferred Stock [Member] | Third Anniversary of Financing Transactions [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Increase in dividends payable percentage | 0.50% |  |  |
Series E Redeemable Preferred Stock [Member] | Fourth Anniversary of Financing Transactions [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Additional increase in dividends payable percentage | 0.50% |  |  |
Series E Redeemable Preferred Stock [Member] | Fifth Anniversary of Financing Transactions [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Additional increase in dividends payable percentage | 1.00% |  |  |
Series E Redeemable Preferred Stock [Member] | Climate Control Group [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Redemption of preferred stock, shares |  |  | 70,232 |
Redemption of preferred stock |  |  | $ 80,000,000 |
Preferred Stock, Liquidation Preference, Value |  |  | $ 78,300,000 |
Liquidation preference per share |  |  | $ 1,000 |
Redeemable preferred stock, liquidation preference |  |  | $ 1,700,000 |
Preferred stock, shares outstanding | 139,768 |  |  |
Series B Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ 2,785,000 | $ 2,545,000 |  |
Preferred stock, shares outstanding | 20,000 | 20,000 |  |
Preferred stock cumulative dividend rate | 12.00% | 12.00% |  |
Series D Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ 1,192,000 | $ 1,132,000 |  |
Preferred stock, shares outstanding | 1,000,000 | 1,000,000 |  |
Preferred stock cumulative dividend rate | 6.00% | 6.00% |  |
Series F Redeemable Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Voting rights description | The Series F COD authorizes one (1) shares of Series F Redeemable Preferred. The Series F Redeemable Preferred had voting rights (the “Series F Voting Rights”) to vote as a single class on all matters which the common stock have the right to vote and was entitled to a number of votes equal to 4,559,971 shares of our common stock, but, the number of votes that may be cast by the Series F Redeemable Preferred was reduced automatically to 456,225 shares of common stock upon the exercise of the warrants during 2016 as discussed below. |  |  |
Series F Redeemable Preferred Stock [Member] | Upon Liquidation Event [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Liquidation preference per share | $ 100 |  |  |
Preferred stock redemption price per share | $ 0.01 |  |  |
Series F Redeemable Preferred Stock [Member] | Maximum [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock voting rights shares | 4,559,971 |  |  |
Series F Redeemable Preferred Stock [Member] | Minimum [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock voting rights shares | 456,225 |  |  |
Series E and Series F Redeemable Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock, par value | $ 0.10 |  |  |
Number of common shares into which warrants may be converted | 4,103,746 |  |  |
Warrants exercised period | 2016 |  |  |
Common stock issued, cashless exercise of warrants | 4,103,746 |  |  |
Shares surrendered by holder in payment of exercise price | 34,422 |  |  |
Private Placement [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Renewed rights agreement | 2019-01 |  |  |
Private Placement [Member] | Warrants to Purchase [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock issued |  |  |  | 4,103,746
Common stock, par value |  |  |  | $ 0.10
Private Placement [Member] | Series E Redeemable Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Value of shares under purchase agreement |  |  |  | $ 210,000,000

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