Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	$ 450,315	$ 651,897	$ 661,780
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(191,205)	(139,464)	(171,242)
Acquisition of GWS, including net assets acquired, intangibles and goodwill, net of cash acquired	(10,477)	(1,421,663)
Acquisition of businesses (other than GWS), including net assets acquired, intangibles and goodwill, net of cash acquired	(31,634)	(161,106)	(147,057)
Contributions to unconsolidated subsidiaries	(66,816)	(71,208)	(59,177)
Distributions from unconsolidated subsidiaries	213,446	187,577	104,267
Net proceeds from disposition of real estate held for investment	44,326	3,584	77,278
Additions to real estate held for investment	(3,203)	(2,053)	(10,961)
Proceeds from the sale of servicing rights and other assets	43,531	30,432	25,541
Decrease (increase) in restricted cash	(2,552)	(49,012)	30,889
Purchase of available for sale securities	(37,661)	(40,287)	(89,885)
Proceeds from the sale of available for sale securities	35,051	42,572	88,214
Other investing activities, net	(245)	1,669	577
Net cash provided by (used in) investing activities	(7,439)	(1,618,959)	(151,556)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from senior term loans		900,000
Repayment of senior secured term loans	(136,250)	(657,488)	(39,650)
Proceeds from revolving credit facility	2,909,000	2,643,500	1,873,568
Repayment of revolving credit facility	(2,909,000)	(2,648,012)	(1,999,422)
Proceeds from issuance of senior notes, net		595,440	426,875
Repayment of senior notes			(350,000)
Proceeds from notes payable on real estate held for investment	7,274		5,022
Repayment of notes payable on real estate held for investment	(33,944)	(1,576)	(27,563)
Proceeds from notes payable on real estate held for sale and under development	17,727	20,879	8,274
Repayment of notes payable on real estate held for sale and under development	(4,102)	(1,186)	(80,218)
Shares and units repurchased for payment of taxes on equity awards	(27,426)	(24,523)	(16,685)
Proceeds from exercise of stock options	915	7,525	6,203
Incremental tax benefit from stock options exercised		2,277	1,218
Non-controlling interest contributions	2,272	5,909	2,938
Non-controlling interest distributions	(19,133)	(16,582)	(33,971)
Payment of financing costs	(5,618)	(30,664)	(5,947)
Other financing activities, net	(1,358)	(5,951)	(2,711)
Net cash (used in) provided by financing activities	(199,643)	789,548	(232,069)
Effect of currency exchange rate changes on cash and cash equivalents	(21,060)	(22,967)	(29,183)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	222,173	(200,481)	248,972
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD	540,403	740,884	491,912
CASH AND CASH EQUIVALENTS, AT END OF PERIOD	762,576	540,403	740,884
Cash paid during the period for:
Interest	125,800	88,078	118,749
Income taxes, net	294,848	285,730	331,257
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	84,393	33,959	23,416
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares and units repurchased for payment of taxes on equity awards	(27,426)	(24,523)	(16,685)
Proceeds from exercise of stock options	915	7,525	6,203
Incremental tax benefit from stock options exercised		2,277	1,218
(Increase) decrease in intercompany receivables, net	(57,880)	(19,238)	(14,152)
Net cash (used in) provided by financing activities	(84,391)	(33,959)	(23,416)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	2
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD	5	5	5
CASH AND CASH EQUIVALENTS, AT END OF PERIOD	7	5	5
CBRE [Member]
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	(23,643)	(7,477)	94,165
CASH FLOWS FROM INVESTING ACTIVITIES:
Decrease (increase) in restricted cash			6,871
Net cash provided by (used in) investing activities			6,871
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from senior term loans		900,000
Repayment of senior secured term loans	(136,250)	(657,488)	(39,650)
Proceeds from revolving credit facility	2,909,000	2,643,500	1,807,000
Repayment of revolving credit facility	(2,909,000)	(2,643,500)	(1,835,928)
Proceeds from issuance of senior notes, net		595,440	426,875
Repayment of senior notes			(350,000)
Payment of financing costs	(5,459)	(30,579)	(4,614)
(Increase) decrease in intercompany receivables, net	173,762	(809,679)	(98,042)
Net cash (used in) provided by financing activities	32,053	(2,306)	(94,359)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	8,410	(9,783)	6,677
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD	8,479	18,262	11,585
CASH AND CASH EQUIVALENTS, AT END OF PERIOD	16,889	8,479	18,262
Cash paid during the period for:
Interest	122,605	86,562	112,059
Income taxes, net			37
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	212,841	452,304	345,141
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(115,049)	(84,933)	(109,173)
Acquisition of GWS, including net assets acquired, intangibles and goodwill, net of cash acquired	3,256	(729,729)
Acquisition of businesses (other than GWS), including net assets acquired, intangibles and goodwill, net of cash acquired	(6,572)	(153,690)	(62,071)
Contributions to unconsolidated subsidiaries	(47,192)	(66,966)	(56,634)
Distributions from unconsolidated subsidiaries	206,011	179,699	90,292
Proceeds from the sale of servicing rights and other assets	19,445	14,503	11,655
Decrease (increase) in restricted cash	(546)	(5,791)	2,015
Purchase of available for sale securities	(37,661)	(40,287)	(89,885)
Proceeds from the sale of available for sale securities	35,051	42,572	88,214
Other investing activities, net	(267)	1,669	577
Net cash provided by (used in) investing activities	56,476	(842,953)	(125,010)
CASH FLOWS FROM FINANCING ACTIVITIES:
(Increase) decrease in intercompany receivables, net	(151,433)	167,505	65,602
Other financing activities, net	(1,173)	(3,549)	(2,874)
Net cash (used in) provided by financing activities	(152,606)	163,956	62,728
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	116,711	(226,693)	282,859
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD	147,410	374,103	91,244
CASH AND CASH EQUIVALENTS, AT END OF PERIOD	264,121	147,410	374,103
Cash paid during the period for:
Interest		126	472
Income taxes, net	174,164	179,418	221,898
Nonguarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	176,724	173,111	199,058
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(76,156)	(54,531)	(62,069)
Acquisition of GWS, including net assets acquired, intangibles and goodwill, net of cash acquired	(13,733)	(691,934)
Acquisition of businesses (other than GWS), including net assets acquired, intangibles and goodwill, net of cash acquired	(25,062)	(7,416)	(84,986)
Contributions to unconsolidated subsidiaries	(19,624)	(4,242)	(2,543)
Distributions from unconsolidated subsidiaries	7,435	7,878	13,975
Net proceeds from disposition of real estate held for investment	44,326	3,584	77,278
Additions to real estate held for investment	(3,203)	(2,053)	(10,961)
Proceeds from the sale of servicing rights and other assets	24,086	15,929	13,886
Decrease (increase) in restricted cash	(2,006)	(43,221)	22,003
Other investing activities, net	22
Net cash provided by (used in) investing activities	(63,915)	(776,006)	(33,417)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facility			66,568
Repayment of revolving credit facility		(4,512)	(163,494)
Proceeds from notes payable on real estate held for investment	7,274		5,022
Repayment of notes payable on real estate held for investment	(33,944)	(1,576)	(27,563)
Proceeds from notes payable on real estate held for sale and under development	17,727	20,879	8,274
Repayment of notes payable on real estate held for sale and under development	(4,102)	(1,186)	(80,218)
Non-controlling interest contributions	2,272	5,909	2,938
Non-controlling interest distributions	(19,133)	(16,582)	(33,971)
Payment of financing costs	(159)	(85)	(1,333)
(Increase) decrease in intercompany receivables, net	35,551	661,412	46,592
Other financing activities, net	(185)	(2,402)	163
Net cash (used in) provided by financing activities	5,301	661,857	(177,022)
Effect of currency exchange rate changes on cash and cash equivalents	(21,060)	(22,967)	(29,183)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	97,050	35,995	(40,564)
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD	384,509	348,514	389,078
CASH AND CASH EQUIVALENTS, AT END OF PERIOD	481,559	384,509	348,514
Cash paid during the period for:
Interest	3,195	1,390	6,218
Income taxes, net	$ 120,684	$ 106,312	$ 109,322

Cash Paid During Period For [Abstract]

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The cash inflow from notes payable borrowings associated with real estate held for investment.

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The cash inflow from notes payable borrowings associated with real estate held for sale and real estate under development.

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The cash outflow resulting from the repayment of notes payable associated with real estate held for investment.

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The cash outflow resulting from the repayment of notes payable associated with real estate held for sale and real estate under development.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash (inflow) outflow from investing activities classified as other.

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The cash outflow for loan and debt issuance costs.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with a second acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow associated with the purchase of real estate held for investment purposes.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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Amount of cash inflow (outflow) from financing activities classified as other.

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Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts.

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Amount of cash inflow (outflow) from long-term debt wholly or partially secured by collateral. Excludes tax exempt secured debt.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale of servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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