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Securities Financing Including Redeemable Preferred Stocks- Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Class Of Stock [Line Items]    
Common stock issued 31,280,685 27,131,724
Number of common shares into which warrants may be converted 4,103,746  
Common stock, par value $ 0.10  
Warrants exercised period 2016-05  
Common stock issued, cashless exercise of warrants 4,103,746  
Shares surrendered by holder in payment of exercise price 34,422  
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]    
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 F Redeemable Preferred Stock [Member]    
Class Of Stock [Line Items]    
Common stock voting rights shares 4,559,971  
Voting rights description 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 was entitled to a number of votes equal to 4,559,971 shares of our common stock, however, 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 noted below.  
Series F Redeemable Preferred Stock [Member] | Minimum [Member]    
Class Of Stock [Line Items]    
Common stock voting rights shares after warrants exercised 456,225  
Private Placement [Member] | Warrants to Purchase [Member]    
Class Of Stock [Line Items]    
Common stock issued   4,103,746
Private Placement [Member] | Series E Redeemable Preferred Stock [Member]    
Class Of Stock [Line Items]    
Value of shares under purchase agreement   $ 210,000,000