Regulatory	12 Months Ended
Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Regulatory	Note 17 — Regulatory Certain subsidiaries of the Company are subject to various regulatory requirements in the United States, United Kingdom, Australia and certain other jurisdictions, which specify, among other requirements, minimum net capital requirements for registered broker-dealers. G&Co is subject to the SEC’s Uniform Net Capital requirements under Rule 15c3-1 (the “Rule”), which specifies, among other requirements, minimum net capital requirements for registered broker-dealers. The Rule requires G&Co to maintain a minimum net capital of the greater of $5,000 or 1/15 of aggregate indebtedness, as defined in the Rule. As of December 31, 2017 and 2016, G&Co’s net capital was $5.0 million and $7.3 million, respectively, which exceeded its requirement by $4.0 million and $5.9 million, respectively. G&Co’s aggregate indebtedness to net capital ratio was 3.03 to 1 and 2.80 to 1 at December 31, 2017 and 2016, respectively. Certain distributions and other capital withdrawals of G&Co are subject to certain notifications and restrictive provisions of the Rule. GC LP is also subject to the Rule. GCI, GCE and the European affiliate of GC LP are subject to capital requirements of the FCA. Greenhill Australia is subject to capital requirements of the ASIC. We are also subject to certain capital regulatory requirements in other jurisdictions. As of December 31, 2017 and 2016, GCI, GCE, GC LP, Greenhill Australia, and our other regulated operations were in compliance with local capital adequacy requirements.

Regulatory

12 Months Ended

Dec. 31, 2017

Regulatory Capital Requirements [Abstract]

Note 17 — Regulatory

Certain subsidiaries of the Company are subject to various regulatory requirements in the United States, United Kingdom, Australia and certain other jurisdictions, which specify, among other requirements, minimum net capital requirements for registered broker-dealers.

G&Co is subject to the SEC’s Uniform Net Capital requirements under Rule 15c3-1 (the “Rule”), which specifies, among other requirements, minimum net capital requirements for registered broker-dealers. The Rule requires G&Co to maintain a minimum net capital of the greater of $5,000 or 1/15 of aggregate indebtedness, as defined in the Rule. As of December 31, 2017 and 2016, G&Co’s net capital was $5.0 million and $7.3 million, respectively, which exceeded its requirement by $4.0 million and $5.9 million, respectively. G&Co’s aggregate indebtedness to net capital ratio was 3.03 to 1 and 2.80 to 1 at December 31, 2017 and 2016, respectively. Certain distributions and other capital withdrawals of G&Co are subject to certain notifications and restrictive provisions of the Rule.

GC LP is also subject to the Rule. GCI, GCE and the European affiliate of GC LP are subject to capital requirements of the FCA. Greenhill Australia is subject to capital requirements of the ASIC. We are also subject to certain capital regulatory requirements in other jurisdictions. As of December 31, 2017 and 2016, GCI, GCE, GC LP, Greenhill Australia, and our other regulated operations were in compliance with local capital adequacy requirements.