XML 33 R32.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investment Portfolio - Carrying Value and Income from Partnerships (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Investment Holdings [Abstract]    
Total partnership assets $ 117,713,981 $ 105,472,952
Total partnership liabilities 22,226,971 17,786,579
Net partnership assets 95,487,010 87,686,373
DHCM's portion of net assets 4,239,545 3,650,561
Net partnership income 19,286,862 15,054,951
DHCM's portion of net income $ 588,984 $ 472,659