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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | $ 710,505 | $ 450,315 | $ 651,897
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (178,042) | (191,205) | (139,464)
Acquisition of businesses (other than GWS), including net assets acquired, intangibles and goodwill, net of cash acquired | (142,433) | (31,634) | (161,106)
Contributions to unconsolidated subsidiaries | (68,700) | (66,816) | (71,208)
Distributions from unconsolidated subsidiaries | 247,574 | 213,446 | 187,577
Decrease (increase) in restricted cash | 1,281 | (2,552) | (49,012)
Purchase of available for sale securities | (34,864) | (37,661) | (40,287)
Proceeds from the sale of available for sale securities | 31,377 | 35,051 | 42,572
Other investing activities, net | 2,392 | 40,083 | 30,048
Net cash used in investing activities | (141,415) | (7,439) | (1,618,959)
Acquisition of GWS, including net assets acquired, intangibles and goodwill |  | (10,477) | (1,421,663)
Net proceeds from disposition of real estate held for investment |  | 44,326 | 3,584
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from senior term loans | 200,000 |  | 900,000
Repayment of senior term loans | (751,876) | (136,250) | (657,488)
Proceeds from revolving credit facility | 1,521,000 | 2,909,000 | 2,643,500
Repayment of revolving credit facility | (1,521,000) | (2,909,000) | (2,648,012)
Proceeds from notes payable on real estate held for investment | 137 | 7,274 |
Proceeds from issuance of senior notes, net |  |  | 595,440
Repayment of notes payable on real estate held for investment | (1,779) | (33,944) | (1,576)
Proceeds from notes payable on real estate held for sale and under development | 4,196 | 17,727 | 20,879
Repayment of notes payable on real estate held for sale and under development | (10,777) | (4,102) | (1,186)
Shares and units repurchased for payment of taxes on equity awards | (29,549) | (27,426) | (24,523)
Non-controlling interest contributions | 5,301 | 2,272 | 5,909
Non-controlling interest distributions | (8,715) | (19,133) | (16,582)
Payment of financing costs | (7,999) | (5,618) | (30,664)
Other financing activities, net | (2,675) | (443) | 3,851
Net cash (used in) provided by financing activities | (603,736) | (199,643) | 789,548
Effect of currency exchange rate changes on cash and cash equivalents | 23,844 | (21,060) | (22,967)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (10,802) | 222,173 | (200,481)
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD | 762,576 | 540,403 | 740,884
CASH AND CASH EQUIVALENTS, AT END OF PERIOD | 751,774 | 762,576 | 540,403
Cash paid during the period for: |  |  |
Interest | 117,164 | 125,800 | 88,078
Income taxes, net | 356,997 | 294,848 | 285,730
Parent [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 89,341 | 84,393 | 33,959
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Shares and units repurchased for payment of taxes on equity awards | (29,549) | (27,426) | (24,523)
(Increase) decrease in intercompany receivables, net | (60,271) | (57,880) | (19,238)
Other financing activities, net | 479 | 915 | 9,802
Net cash (used in) provided by financing activities | (89,341) | (84,391) | (33,959)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS |  | 2 |
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD | 7 | 5 | 5
CASH AND CASH EQUIVALENTS, AT END OF PERIOD | 7 | 7 | 5
Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 241,015 | 212,841 | 452,304
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (121,347) | (115,049) | (84,933)
Acquisition of businesses (other than GWS), including net assets acquired, intangibles and goodwill, net of cash acquired | (107,102) | (6,572) | (153,690)
Contributions to unconsolidated subsidiaries | (63,119) | (47,192) | (66,966)
Distributions from unconsolidated subsidiaries | 236,806 | 206,011 | 179,699
Decrease (increase) in restricted cash | 4,872 | (546) | (5,791)
Purchase of available for sale securities | (34,864) | (37,661) | (40,287)
Proceeds from the sale of available for sale securities | 31,377 | 35,051 | 42,572
Other investing activities, net | 1,968 | 19,178 | 16,172
Net cash used in investing activities | (51,409) | 56,476 | (842,953)
Acquisition of GWS, including net assets acquired, intangibles and goodwill |  | 3,256 | (729,729)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
(Increase) decrease in intercompany receivables, net | (338,534) | (151,433) | 167,505
Other financing activities, net | (3,145) | (1,173) | (3,549)
Net cash (used in) provided by financing activities | (341,679) | (152,606) | 163,956
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (152,073) | 116,711 | (226,693)
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD | 264,121 | 147,410 | 374,103
CASH AND CASH EQUIVALENTS, AT END OF PERIOD | 112,048 | 264,121 | 147,410
Cash paid during the period for: |  |  |
Interest |  |  | 126
Income taxes, net | 198,520 | 174,164 | 179,418
Nonguarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 342,159 | 176,724 | 173,111
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (56,695) | (76,156) | (54,531)
Acquisition of businesses (other than GWS), including net assets acquired, intangibles and goodwill, net of cash acquired | (35,331) | (25,062) | (7,416)
Contributions to unconsolidated subsidiaries | (5,581) | (19,624) | (4,242)
Distributions from unconsolidated subsidiaries | 10,768 | 7,435 | 7,878
Decrease (increase) in restricted cash | (3,591) | (2,006) | (43,221)
Other investing activities, net | 424 | 20,905 | 13,876
Net cash used in investing activities | (90,006) | (63,915) | (776,006)
Acquisition of GWS, including net assets acquired, intangibles and goodwill |  | (13,733) | (691,934)
Net proceeds from disposition of real estate held for investment |  | 44,326 | 3,584
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repayment of revolving credit facility |  |  | (4,512)
Proceeds from notes payable on real estate held for investment | 137 | 7,274 |
Repayment of notes payable on real estate held for investment | (1,779) | (33,944) | (1,576)
Proceeds from notes payable on real estate held for sale and under development | 4,196 | 17,727 | 20,879
Repayment of notes payable on real estate held for sale and under development | (10,777) | (4,102) | (1,186)
Non-controlling interest contributions | 5,301 | 2,272 | 5,909
Non-controlling interest distributions | (8,715) | (19,133) | (16,582)
Payment of financing costs | (21) | (159) | (85)
(Increase) decrease in intercompany receivables, net | (121,774) | 35,551 | 661,412
Other financing activities, net | (9) | (185) | (2,402)
Net cash (used in) provided by financing activities | (133,441) | 5,301 | 661,857
Effect of currency exchange rate changes on cash and cash equivalents | 23,844 | (21,060) | (22,967)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | 142,556 | 97,050 | 35,995
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD | 481,559 | 384,509 | 348,514
CASH AND CASH EQUIVALENTS, AT END OF PERIOD | 624,115 | 481,559 | 384,509
Cash paid during the period for: |  |  |
Interest | 92 | 3,195 | 1,390
Income taxes, net | 158,477 | 120,684 | 106,312
CBRE Services [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 37,990 | (23,643) | (7,477)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from senior term loans | 200,000 |  | 900,000
Repayment of senior term loans | (751,876) | (136,250) | (657,488)
Proceeds from revolving credit facility | 1,521,000 | 2,909,000 | 2,643,500
Repayment of revolving credit facility | (1,521,000) | (2,909,000) | (2,643,500)
Proceeds from issuance of senior notes, net |  |  | 595,440
Payment of financing costs | (7,978) | (5,459) | (30,579)
(Increase) decrease in intercompany receivables, net | 520,579 | 173,762 | (809,679)
Net cash (used in) provided by financing activities | (39,275) | 32,053 | (2,306)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (1,285) | 8,410 | (9,783)
CASH AND CASH EQUIVALENTS, AT BEGINNING OF PERIOD | 16,889 | 8,479 | 18,262
CASH AND CASH EQUIVALENTS, AT END OF PERIOD | 15,604 | 16,889 | 8,479
Cash paid during the period for: |  |  |
Interest | $ 117,072 | $ 122,605 | $ 86,562

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount of cash inflow (outflow) from long-term debt wholly or partially secured by collateral. Excludes tax exempt secured debt. + References No definition available. + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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