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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclsoure [Line Items]
Foreign loss carryforwards	$ 11,400,000
Deferred tax assets, compensation deductible	800,000
Minimum period for which losses may be carried forward	20 years
Valuation Allowance, Amount	7,611,000	4,519,000
Foreign tax credit carryforwards	6,206,000	4,102,000
Additional tax from repatriation of total earnings	500,000
Period for which losses may be carried forward	Twenty years and longer
Current taxes payable	15,800,000	7,900,000
Greenhill & Co., Europe Holdings, Limited [Member]
Income Tax Disclsoure [Line Items]
Valuation Allowance, Amount	1,900,000	400,000
US Foreign Tax Credit Carryforwards [Member]
Income Tax Disclsoure [Line Items]
Valuation Allowance, Amount	$ 5,700,000	$ 4,100,000

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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