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Investment Portfolio Equity Method Investments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Total assets $ 189,819,824 $ 11,653,249 $ 15,131,651
Total liabilities 45,931,979 25,996 3,015
Net assets 143,887,845 11,627,253 15,128,636
DHCM's portion of net assets 41,338,046 11,284,109 14,652,589
Investment income 3,272,972 792,691 128,826
Expenses 1,409,896 5,506 5,362
Net realized gains (losses) 1,981,185 1,219,565 262,754
Net change in unrealized appreciation/depreciation 10,458,073 (1,879,047) 137,935
Net income 14,302,334 127,703 524,153
DHCM's portion of net income $ 4,392,636 $ 124,825 $ 491,951