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Investment Portfolio - Carrying Value and Income from Partnerships (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Total partnership assets $ 117,216,278 $ 122,106,403
Total partnership liabilities 22,482,499 25,217,600
Net partnership assets 94,733,779 96,888,803
DHCM’s portion of net assets 4,742,369 3,001,461
Net partnership income 7,653,524 24,294,495
DHCM’s portion of net income $ 315,908 $ 899,958