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Securities Financing Including Redeemable Preferred Stocks - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2018
shares
Series E Redeemable Preferred Stock [Member]  
Class Of Stock [Line Items]  
Redeemable preferred stock, redemption term The letter agreement extended the date upon which the holder of the Series E Redeemable Preferred has the right to elect to redeem the Series E Redeemable Preferred shares from August 2, 2019 to October 25, 2023. The letter agreement also provides 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 cumulative dividend rate 14.00%
Participating right in dividends and liquidating distributions expressed in number of common shares 303,646
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 F Redeemable Preferred Stock [Member]  
Class Of Stock [Line Items]  
Common stock voting rights shares 456,225
Voting rights description As of September 30, 2018, 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 456,225 shares of our common stock.