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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | $ 1,131,249 | $ 894,411 | $ 616,985
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (227,803) | (178,042) | (191,205)
Acquisition of businesses, including net assets acquired, intangibles and goodwill, net of cash acquired | (322,573) | (118,427) | (21,077)
Contributions to unconsolidated subsidiaries | (62,802) | (68,700) | (66,816)
Distributions from unconsolidated subsidiaries | 61,709 | 63,664 | 46,775
Net proceeds from disposition of real estate held for investment | 14,174 |  | 44,326
Purchase of equity securities | (21,402) | (15,584) | (15,506)
Proceeds from sale of equity securities | 16,314 | 15,587 | 16,954
Purchase of available for sale debt securities | (23,360) | (19,280) | (22,155)
Proceeds from the sale of available for sale debt securities | 5,792 | 15,790 | 18,097
Other investing activities, net | (733) | 2,392 | 40,083
Net cash used in investing activities | (560,684) | (302,600) | (150,524)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from senior term loans | 1,002,745 | 200,000 |
Repayment of senior term loans | (450,000) | (751,876) | (136,250)
Proceeds from revolving credit facility | 3,258,000 | 1,521,000 | 2,909,000
Repayment of revolving credit facility | (3,258,000) | (1,521,000) | (2,909,000)
Repayment of 5.00% senior notes (including premium) | (820,000) |  |
Proceeds from notes payable on real estate | 7,599 | 4,333 | 25,001
Repayment of notes payable on real estate | (19,058) | (12,556) | (38,046)
Repayment of debt assumed in acquisition of FacilitySource | (26,295) |  |
Repurchase of common stock | (161,034) |  |
Acquisition of businesses (cash paid for acquisitions more than three months after purchase date) | (18,660) | (24,006) | (21,034)
Units repurchased for payment of taxes on equity awards | (29,386) | (29,549) | (27,426)
Non-controlling interest contributions | 25,355 | 5,301 | 2,272
Non-controlling interest distributions | (13,413) | (8,715) | (19,133)
Payment of financing costs | (2,088) | (7,999) | (5,618)
Other financing activities, net | (2,365) | (2,675) | (443)
Net cash used in financing activities | (506,600) | (627,742) | (220,677)
Effect of currency exchange rate changes on cash and cash equivalents and restricted cash | (24,840) | 29,338 | (27,539)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH | 39,125 | (6,593) | 218,245
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT BEGINNING OF PERIOD | 824,819 | 831,412 | 613,167
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT END OF PERIOD | 863,944 | 824,819 | 831,412
Cash paid during the period for: |  |  |
Interest | 104,165 | 117,164 | 125,800
Income taxes, net | 375,849 | 356,997 | 294,848
Parent [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 105,850 | 89,341 | 84,393
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repurchase of common stock | (161,034) |  |
Units repurchased for payment of taxes on equity awards | (29,386) | (29,549) | (27,426)
Decrease (increase) in intercompany receivables, net | 84,213 | (60,271) | (57,880)
Other financing activities, net | 357 | 479 | 915
Net cash used in financing activities | (105,850) | (89,341) | (84,391)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH |  |  | 2
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT BEGINNING OF PERIOD | 7 | 7 | 5
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT END OF PERIOD | 7 | 7 | 7
CBRE Services [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 21,834 | 37,990 | (23,643)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from senior term loans | 550,000 | 200,000 |
Repayment of senior term loans | (450,000) | (751,876) | (136,250)
Proceeds from revolving credit facility | 3,258,000 | 1,521,000 | 2,909,000
Repayment of revolving credit facility | (3,258,000) | (1,521,000) | (2,909,000)
Repayment of 5.00% senior notes (including premium) | (820,000) |  |
Payment of financing costs | (212) | (7,978) | (5,459)
Decrease (increase) in intercompany receivables, net | 716,837 | 520,579 | 173,762
Net cash used in financing activities | (3,375) | (39,275) | 32,053
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH | 18,459 | (1,285) | 8,410
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT BEGINNING OF PERIOD | 15,604 | 16,889 | 8,479
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT END OF PERIOD | 34,063 | 15,604 | 16,889
Cash paid during the period for: |  |  |
Interest | 102,491 | 117,072 | 122,605
Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 429,540 | 424,787 | 296,501
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (140,670) | (121,347) | (115,049)
Acquisition of businesses, including net assets acquired, intangibles and goodwill, net of cash acquired | (305,315) | (87,248) | (2,191)
Contributions to unconsolidated subsidiaries | (51,046) | (63,119) | (47,192)
Distributions from unconsolidated subsidiaries | 57,269 | 52,896 | 39,340
Purchase of equity securities | (21,402) | (15,584) | (15,506)
Proceeds from sale of equity securities | 16,314 | 15,587 | 16,954
Purchase of available for sale debt securities | (23,360) | (19,280) | (22,155)
Proceeds from the sale of available for sale debt securities | 5,792 | 15,790 | 18,097
Other investing activities, net | 2,793 | 1,968 | 19,178
Net cash used in investing activities | (459,625) | (220,337) | (108,524)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repayment of debt assumed in acquisition of FacilitySource | (26,295) |  |
Acquisition of businesses (cash paid for acquisitions more than three months after purchase date) | (16,774) | (19,854) | (1,125)
Decrease (increase) in intercompany receivables, net | 233,975 | (338,396) | (68,422)
Other financing activities, net | (16) | (3,145) | (1,173)
Net cash used in financing activities | 190,890 | (361,395) | (70,720)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH | 160,805 | (156,945) | 117,257
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT BEGINNING OF PERIOD | 114,143 | 271,088 | 153,831
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT END OF PERIOD | 274,948 | 114,143 | 271,088
Cash paid during the period for: |  |  |
Income taxes, net | 198,930 | 198,520 | 174,164
Nonguarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES: | 574,025 | 342,293 | 259,734
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (87,133) | (56,695) | (76,156)
Acquisition of businesses, including net assets acquired, intangibles and goodwill, net of cash acquired | (17,258) | (31,179) | (18,886)
Contributions to unconsolidated subsidiaries | (11,756) | (5,581) | (19,624)
Distributions from unconsolidated subsidiaries | 4,440 | 10,768 | 7,435
Net proceeds from disposition of real estate held for investment | 14,174 |  | 44,326
Other investing activities, net | (3,526) | 424 | 20,905
Net cash used in investing activities | (101,059) | (82,263) | (42,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from senior term loans | 452,745 |  |
Proceeds from notes payable on real estate | 7,599 | 4,333 | 25,001
Repayment of notes payable on real estate | (19,058) | (12,556) | (38,046)
Acquisition of businesses (cash paid for acquisitions more than three months after purchase date) | (1,886) | (4,152) | (19,909)
Non-controlling interest contributions | 25,355 | 5,301 | 2,272
Non-controlling interest distributions | (13,413) | (8,715) | (19,133)
Payment of financing costs | (1,876) | (21) | (159)
Decrease (increase) in intercompany receivables, net | (1,035,025) | (121,912) | (47,460)
Other financing activities, net | (2,706) | (9) | (185)
Net cash used in financing activities | (588,265) | (137,731) | (97,619)
Effect of currency exchange rate changes on cash and cash equivalents and restricted cash | (24,840) | 29,338 | (27,539)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH | (140,139) | 151,637 | 92,576
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT BEGINNING OF PERIOD | 695,065 | 543,428 | 450,852
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, AT END OF PERIOD | 554,926 | 695,065 | 543,428
Cash paid during the period for: |  |  |
Interest | 1,674 | 92 | 3,195
Income taxes, net | $ 176,919 | $ 158,477 | $ 120,684

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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