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Investment Portfolio - Carrying Value and Income from Partnerships (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Investment Holdings [Abstract]    
Total partnership assets $ 116,493,564 $ 105,472,952
Total partnership liabilities 24,467,756 17,786,579
Net partnership assets 92,025,808 87,686,373
DHCM's portion of net assets 3,991,509 3,650,561
Net partnership income 15,182,661 15,054,951
DHCM's portion of net income $ 340,689 $ 472,659