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Investment Portfolio - Carrying Value and Income from Partnerships (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Total partnership assets $ 112,580,280 $ 122,106,403
Total partnership liabilities 20,624,650 25,217,600
Net partnership assets 91,955,630 96,888,803
DHCM’s portion of net assets 4,711,277 3,001,461
Net partnership income 4,682,472 24,294,495
DHCM’s portion of net income $ 286,013 $ 899,958