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Securities Financing Including Redeemable Preferred Stocks- Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 04, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |  |
Common stock issued |  | 27,131,724 | 26,968,212
Common stock, par value |  | $ 0.10 |
Estimated fair value of warrant |  | $ 22,300,000 |
Number of common shares into which warrants may be converted |  | 4,103,746 |
Warrants, last exercisable date |  | Dec. 04, 2025 |
Liquidated damages percentage |  | 0.25% |
Additional liquidated damages percentage |  | 0.25% |
Maximum increase of liquidated damages |  | 1.00% |
Aggregate liquidated damages percentage |  | 3.00% |
Series E Redeemable Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Estimated fair value of preferred stock |  | $ 187,700,000 |
Preferred stock cumulative dividend rate |  | 14.00% |
Participating right in dividends and liquidating distributions expressed in number of common shares |  | 456,225 |
Participating right in dividends and liquidating distributions expressed as a percentage of common shares |  | 2.00% |
Minimum percentage of stock holding required |  | 10.00% |
Liquidation preference per share |  | $ 1,000 |
Series E Redeemable Preferred Stock [Member] | Certificate of Designations [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred shares authorized |  | 210,000 |
Series B Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock cumulative dividend rate |  | 12.00% | 12.00%
Series D Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock cumulative dividend rate |  | 6.00% | 6.00%
Series F Redeemable Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Common stock voting rights shares |  | 4,559,971 |
Percentage of common stock voting rights |  | 19.99% |
Voting rights description |  | The Series F COD authorizes one (1) shares of Series F Redeemable Preferred. The Series F Redeemable Preferred has 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 is entitled to a number of votes equal to 4,559,971 shares of our common stock, which is equal to 19.99% of the number of outstanding shares of our common stock before the completion of the Private Placement; provided however, the number of votes that may be cast by the Series F Redeemable Preferred will be reduced automatically upon the occurrence of the following specified events:  upon any exercise of the Warrants, the Series F Voting Rights shall be reduced by a number of votes equal to the number of shares of our common stock into which the Warrants are exercised,  upon the redemption or exchange of each share of Series E for our common stock, the Series F Voting Rights shall be reduced by a number of shares of common stock equal to the amount specified in clauses (i) and (ii) of Participation Rights Value as specified in the Series E COD, and  upon (A) expiration of the exercise period set forth in the Warrants or exercise in full of the Warrants and (B) redemption or exchange in full of all shares of Series E Redeemable Preferred for our common stock, cash or otherwise, the Series F Voting Rights shall be reduced to zero. |
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 |
Private Placement [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Percentage of common shares into which warrants may be converted | 17.99% |  |
Renewed rights agreement | Dec. 04, 2008 |  |
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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- Definition Description of the type or class of security that is classified as temporary equity, including its redemption features (for example, sinking fund, at option of holders, out of future earnings), conversion features, and the rights of holders, if any, in the event of default, including the effect, if any, on junior securities in the event a required dividend, sinking fund, or other redemption payment(s) is not paid. Include also a description of stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27011957&loc=d3e177068-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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