Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Consolidated net income	$ 43,388us-gaap_ProfitLoss	$ 46,682us-gaap_ProfitLoss	$ 42,092us-gaap_ProfitLoss
Non-cash items included in consolidated net income:
Depreciation and amortization	3,228us-gaap_DepreciationAndAmortization	4,461us-gaap_DepreciationAndAmortization	7,240us-gaap_DepreciationAndAmortization
Net investment losses	6,594us-gaap_GainLossOnInvestments	1,418us-gaap_GainLossOnInvestments	8,401us-gaap_GainLossOnInvestments
Restricted stock units recognized and common stock issued	39,990us-gaap_RestrictedStockExpense	56,100us-gaap_RestrictedStockExpense	54,178us-gaap_RestrictedStockExpense
Deferred taxes	3,633us-gaap_DeferredIncomeTaxExpenseBenefit	(7,710)us-gaap_DeferredIncomeTaxExpenseBenefit	(18,232)us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred gain on sale of certain merchant banking assets	(195)us-gaap_RecognitionOfDeferredRevenue	(195)us-gaap_RecognitionOfDeferredRevenue	(260)us-gaap_RecognitionOfDeferredRevenue
Changes in operating assets and liabilities:
Advisory fees receivable	3,465	(30,792)	(1,170)
Due (from) affiliates	0	0	(3)
Other receivables and assets	(4,099)	(1,333)	(686)
Compensation payable	12,554	(7,556)	(11,112)
Accounts payable and accrued expenses	69	7,162	6,388
Current income taxes payable	(5,338)	(452)	7,915
Net cash provided by operating activities	103,289	67,785	94,751
Investing activities:
Purchases of investments	(28)us-gaap_PaymentsToAcquireInvestments	(560)us-gaap_PaymentsToAcquireInvestments	(6,536)us-gaap_PaymentsToAcquireInvestments
Proceeds from sales of investments	0	36,230	57,834
Distributions from investments	658	1,283	3,040
Financing liability	0ghl_PaymentOfFinancingLiability	0ghl_PaymentOfFinancingLiability	(15,507)ghl_PaymentOfFinancingLiability
Purchases of property and equipment	(2,439)	(1,151)	(2,833)
Net cash provided by investing activities	(1,809)	35,802	35,998
Financing activities:
Proceeds from revolving bank loan	72,176us-gaap_ProceedsFromLinesOfCredit	109,150us-gaap_ProceedsFromLinesOfCredit	114,870us-gaap_ProceedsFromLinesOfCredit
Repayment of revolving bank loan	(67,425)us-gaap_RepaymentsOfLinesOfCredit	(107,426)us-gaap_RepaymentsOfLinesOfCredit	(113,845)us-gaap_RepaymentsOfLinesOfCredit
Distributions to noncontrolling interests	0us-gaap_PaymentsToMinorityShareholders	(311)us-gaap_PaymentsToMinorityShareholders	0us-gaap_PaymentsToMinorityShareholders
Dividends paid	(56,283)us-gaap_PaymentsOfDividendsCommonStock	(56,225)us-gaap_PaymentsOfDividendsCommonStock	(57,129)us-gaap_PaymentsOfDividendsCommonStock
Purchase of treasury stock	(36,179)	(55,406)	(83,165)
Net tax benefit (cost) from the delivery of restricted stock units and payment of dividend equivalents	(2,888)	8	(3,366)
Net cash used in financing activities	(90,599)	(110,210)	(142,635)
Effect of exchange rate changes on cash and cash equivalents	(2,620)	(1,022)	160
Net (decrease) in cash and cash equivalents	8,261	(7,645)	(11,726)
Cash and cash equivalents, beginning of year	42,679	50,324	62,050
Cash and cash equivalents, end of year	50,940	42,679	50,324
Supplemental disclosure of cash flow information:
Cash paid for interest	1,116us-gaap_InterestPaid	989us-gaap_InterestPaid	1,114us-gaap_InterestPaid
Cash paid for taxes, net of refunds	$ 26,079us-gaap_IncomeTaxesPaidNet	$ 32,521us-gaap_IncomeTaxesPaidNet	$ 36,158us-gaap_IncomeTaxesPaidNet

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