Regulated Subsidiaries	12 Months Ended
Dec. 31, 2012
Regulated Subsidiaries [Abstract]
Regulated Subsidiaries [Text Block]	Regulated Subsidiaries Duff & Phelps Securities, LLC (“Securities”), a wholly-owned subsidiary of the Company, is a registered U.S. broker-dealer, subject to the SEC's “Uniform Net Capital Rule,” Rule 15c3-1. At December 31, 2012, Securities reported net capital of $4,369 which was $4,320 in excess of its net capital requirement of $49. At December 31, 2011, Securities reported net capital of $5,868 which was $5,761 in excess of its net capital requirement of $107. Aggregate indebtedness of Securities totaled $741 and $1,716 at December 31, 2012 and 2011, respectively. Duff & Phelps Securities, Limited (“Securities Ltd.”), a wholly-owned subsidiary of the Company, is a registered United Kingdom broker-dealer, authorized and regulated by the Financial Services Authority. Securities Ltd. is currently registered in England and Wales. At December 31, 2012, the entity reported net capital of £1,923 which was £1,880 in excess of its net capital requirement of £43. At December 31, 2011, the entity reported net capital of £443 which was £399 in excess of its net capital requirement of £44. GCP Securities, LLC ("GCP Securities"), a wholly-owned subsidiary of the Company, is a registered U.S. broker-dealer, subject to the SEC's “Uniform Net Capital Rule,” Rule 15c3-1. The Company acquired GCP Securities on June 30, 2011. At December 31, 2012, GCP Securities reported net capital of $141 which was $136 in excess of its net capital requirement of $5. At December 31, 2011, GCP Securities reported net capital of $141 which was $109 in excess of its net capital requirement of $32. There was no aggregate indebtedness at December 31, 2012. Aggregate indebtedness of GCP Securities totaled$473 at December 31, 2011. Pagemill Partners, LLC ("Pagemill"), a wholly-owned subsidiary of the Company, is a registered U.S. broker-dealer, subject to the SEC's “Uniform Net Capital Rule,” Rule 15c3-1. At December 31, 2012, Pagemill reported net capital of $3,556 which was $3,534 in excess of its net capital requirement of $22. At December 31, 2011, Pagemill reported net capital of $159 which was $149 in excess of its net capital requirement of $10. Aggregate indebtedness of Pagemill totaled $329 and $151 at December 31, 2012 and 2011, respectively. Duff & Phelps SAS is regulated by the Autorité des marchés financiers (“AMF”). The AMF is an independent public body located in France. Duff & Phelps SAS is permitted to conduct certain regulated activities in France as a result of this authorization. There is no net capital requirement for Duff & Phelps SAS.

Regulated Subsidiaries

Duff & Phelps Securities, LLC (“Securities”), a wholly-owned subsidiary of the Company, is a registered U.S. broker-dealer, subject to the SEC's “Uniform Net Capital Rule,” Rule 15c3-1. At December 31, 2012, Securities reported net capital of $4,369 which was $4,320 in excess of its net capital requirement of $49. At December 31, 2011, Securities reported net capital of $5,868 which was $5,761 in excess of its net capital requirement of $107. Aggregate indebtedness of Securities totaled $741 and $1,716 at December 31, 2012 and 2011, respectively.

Duff & Phelps Securities, Limited (“Securities Ltd.”), a wholly-owned subsidiary of the Company, is a registered United Kingdom broker-dealer, authorized and regulated by the Financial Services Authority. Securities Ltd. is currently registered in England and Wales. At December 31, 2012, the entity reported net capital of £1,923 which was £1,880 in excess of its net capital requirement of £43. At December 31, 2011, the entity reported net capital of £443 which was £399 in excess of its net capital requirement of £44.

GCP Securities, LLC ("GCP Securities"), a wholly-owned subsidiary of the Company, is a registered U.S. broker-dealer, subject to the SEC's “Uniform Net Capital Rule,” Rule 15c3-1. The Company acquired GCP Securities on June 30, 2011. At December 31, 2012, GCP Securities reported net capital of $141 which was $136 in excess of its net capital requirement of $5. At December 31, 2011, GCP Securities reported net capital of $141 which was $109 in excess of its net capital requirement of $32. There was no aggregate indebtedness at December 31, 2012. Aggregate indebtedness of GCP Securities totaled$473 at December 31, 2011.

Pagemill Partners, LLC ("Pagemill"), a wholly-owned subsidiary of the Company, is a registered U.S. broker-dealer, subject to the SEC's “Uniform Net Capital Rule,” Rule 15c3-1. At December 31, 2012, Pagemill reported net capital of $3,556 which was $3,534 in excess of its net capital requirement of $22. At December 31, 2011, Pagemill reported net capital of $159 which was $149 in excess of its net capital requirement of $10. Aggregate indebtedness of Pagemill totaled $329 and $151 at December 31, 2012 and 2011, respectively.

Duff & Phelps SAS is regulated by the Autorité des marchés financiers (“AMF”). The AMF is an independent public body located in France. Duff & Phelps SAS is permitted to conduct certain regulated activities in France as a result of this authorization. There is no net capital requirement for Duff & Phelps SAS.