Organization	12 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Note 1 — Organization Greenhill & Co., Inc. and subsidiaries (the "Company" or "Greenhill") is a leading independent investment bank that provides financial and strategic advice on significant domestic and cross-border mergers and acquisitions, restructurings, financings, capital raisings and other strategic transactions to a diverse client base, including corporations, partnerships, institutions and governments globally. We act for clients located throughout the world from our global offices in the United States, Australia, Brazil, Canada, Germany, Hong Kong, Japan, Sweden, and the United Kingdom. The Company's wholly-owned subsidiaries provide advisory services in various jurisdictions. Our most significant operating entities include: Greenhill & Co., LLC (“G&Co”), Greenhill & Co. International LLP (“GCI”), Greenhill & Co. Europe LLP ("GCE"), Greenhill & Co. Australia Pty Limited (“Greenhill Australia”) and Greenhill Cogent, LP ("GC LP"). G&Co is engaged in investment banking activities principally in the United States. G&Co is registered as a broker-dealer with the Securities and Exchange Commission (“SEC”) and the Financial Industry Regulatory Authority (“FINRA”), and is licensed in all 50 states and the District of Columbia. GCI and GCE are engaged in investment banking activities in the United Kingdom and Europe, respectively, and are subject to regulation by the U.K. Financial Conduct Authority (“FCA”). Greenhill Australia engages in investment banking activities in Australia and New Zealand and is licensed and subject to regulation by the Australian Securities and Investment Commission (“ASIC”). GC LP is engaged in capital advisory services to institutional investors principally in the United States and is registered as a broker-dealer with the SEC and FINRA. See "Note 3 — Acquisition". The Company also operates in other locations throughout the world which are subject to regulation by other governmental and regulatory bodies and self-regulatory authorities.

Note 1 — Organization

Greenhill & Co., Inc. and subsidiaries (the "Company" or "Greenhill") is a leading independent investment bank that provides financial and strategic advice on significant domestic and cross-border mergers and acquisitions, restructurings, financings, capital raisings and other strategic transactions to a diverse client base, including corporations, partnerships, institutions and governments globally. We act for clients located throughout the world from our global offices in the United States, Australia, Brazil, Canada, Germany, Hong Kong, Japan, Sweden, and the United Kingdom.

The Company's wholly-owned subsidiaries provide advisory services in various jurisdictions. Our most significant operating entities include: Greenhill & Co., LLC (“G&Co”), Greenhill & Co. International LLP (“GCI”), Greenhill & Co. Europe LLP ("GCE"), Greenhill & Co. Australia Pty Limited (“Greenhill Australia”) and Greenhill Cogent, LP ("GC LP").

G&Co is engaged in investment banking activities principally in the United States. G&Co is registered as a broker-dealer with the Securities and Exchange Commission (“SEC”) and the Financial Industry Regulatory Authority (“FINRA”), and is licensed in all 50 states and the District of Columbia. GCI and GCE are engaged in investment banking activities in the United Kingdom and Europe, respectively, and are subject to regulation by the U.K. Financial Conduct Authority (“FCA”). Greenhill Australia engages in investment banking activities in Australia and New Zealand and is licensed and subject to regulation by the Australian Securities and Investment Commission (“ASIC”). GC LP is engaged in capital advisory services to institutional investors principally in the United States and is registered as a broker-dealer with the SEC and FINRA. See "Note 3 — Acquisition".

The Company also operates in other locations throughout the world which are subject to regulation by other governmental and regulatory bodies and self-regulatory authorities.