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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue | $ 23,894,091 | $ 21,340,088 | $ 18,628,787
Cost of revenue | 18,689,013 | 16,449,212 | 14,305,099
Operating, administrative and other | 3,436,009 | 3,365,773 | 2,858,720
Depreciation and amortization | 439,224 | 451,988 | 406,114
Intangible asset impairment | 89,787 |  |
Total costs and expenses | 22,654,033 | 20,266,973 | 17,569,933
Gain on disposition of real estate | 19,817 | 14,874 | 19,828
Operating income | 1,259,875 | 1,087,989 | 1,078,682
Equity income (loss) from unconsolidated subsidiaries | 160,925 | 324,664 | 210,207
Other income (loss) | 28,907 | 93,020 | 9,405
Interest expense, net of interest income | 85,754 | 98,685 | 126,961
Write-off of financing costs on extinguished debt | 2,608 | 27,982 |
Income before provision for income taxes | 1,361,345 | 1,379,006 | 1,171,333
(Benefit of) provision for income taxes | 69,895 | 313,058 | 467,757
Net income | 1,291,450 | 1,065,948 | 703,576
Less: Net income attributable to non-controlling interests | 9,093 | 2,729 | 6,467
Net income attributable to CBRE Group, Inc. | 1,282,357 | 1,063,219 | 697,109
Eliminations [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Income from consolidated subsidiaries | (2,829,815) | (2,739,432) | (1,859,899)
Income before provision for income taxes | (2,829,815) | (2,739,432) | (1,859,899)
Net income | (2,829,815) | (2,739,432) | (1,859,899)
Net income attributable to CBRE Group, Inc. | (2,829,815) | (2,739,432) | (1,859,899)
Parent [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Operating, administrative and other | 1,000 |  |
Total costs and expenses | 1,000 |  |
Operating income | (1,000) |  |
Income from consolidated subsidiaries | 1,283,103 |  |
Income before provision for income taxes | 1,282,103 |  |
(Benefit of) provision for income taxes | (254) |  |
Net income | 1,282,357 |  |
Net income attributable to CBRE Group, Inc. | 1,282,357 |  |
Parent [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Operating, administrative and other |  | 24,523 | 5,661
Total costs and expenses |  | 24,523 | 5,661
Operating income |  | (24,523) | (5,661)
Income from consolidated subsidiaries |  | 1,081,643 | 700,608
Income before provision for income taxes |  | 1,057,120 | 694,947
(Benefit of) provision for income taxes |  | (6,099) | (2,162)
Net income | 1,282,357 | 1,063,219 | 697,109
Net income attributable to CBRE Group, Inc. |  | 1,063,219 | 697,109
CBRE Services [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Operating, administrative and other | 1,036 |  |
Total costs and expenses | 1,036 |  |
Operating income | (1,036) |  |
Interest expense, net of interest income | (31,037) |  |
Income from consolidated subsidiaries | 1,262,674 |  |
Income before provision for income taxes | 1,290,067 |  |
(Benefit of) provision for income taxes | 6,964 |  |
Net income | 1,283,103 |  |
Net income attributable to CBRE Group, Inc. | 1,283,103 |  |
CBRE Services [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Operating, administrative and other |  | 1,156 | 1,972
Total costs and expenses |  | 1,156 | 1,972
Operating income |  | (1,156) | (1,972)
Other income (loss) |  | 1 | 1
Interest expense, net of interest income |  | (32,031) | (10,648)
Write-off of financing costs on extinguished debt |  | 27,982 |
Income from consolidated subsidiaries |  | 1,079,469 | 695,245
Income before provision for income taxes |  | 1,082,363 | 703,922
(Benefit of) provision for income taxes |  | 720 | 3,314
Net income | 1,283,103 | 1,081,643 | 700,608
Net income attributable to CBRE Group, Inc. |  | 1,081,643 | 700,608
Guarantor Subsidiaries [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue | 13,550,005 |  |
Cost of revenue | 10,836,412 |  |
Operating, administrative and other | 1,705,837 |  |
Depreciation and amortization | 265,220 |  |
Intangible asset impairment | 89,787 |  |
Total costs and expenses | 12,897,256 |  |
Gain on disposition of real estate | 19,432 |  |
Operating income | 672,181 |  |
Equity income (loss) from unconsolidated subsidiaries | 162,019 |  |
Other income (loss) | 7,842 |  |
Interest expense, net of interest income | 80,604 |  |
Royalty and management service (income) expense | (92,728) |  |
Income from consolidated subsidiaries | 284,038 |  |
Income before provision for income taxes | 1,138,204 |  |
(Benefit of) provision for income taxes | (124,470) |  |
Net income | 1,262,674 |  |
Net income attributable to CBRE Group, Inc. | 1,262,674 |  |
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue |  | 11,998,469 | 10,702,005
Cost of revenue |  | 9,513,947 | 8,517,114
Operating, administrative and other |  | 1,715,150 | 1,437,641
Depreciation and amortization |  | 271,378 | 239,863
Total costs and expenses |  | 11,500,475 | 10,194,618
Gain on disposition of real estate |  | 7,705 | 6,037
Operating income |  | 505,699 | 513,424
Equity income (loss) from unconsolidated subsidiaries |  | 323,080 | 206,655
Other income (loss) |  | 103,657 | 22
Interest expense, net of interest income |  | 329,083 | 110,494
Royalty and management service (income) expense |  | (61,626) | 66,191
Income from consolidated subsidiaries |  | 578,320 | 464,046
Income before provision for income taxes |  | 1,243,299 | 1,007,462
(Benefit of) provision for income taxes |  | 163,830 | 312,217
Net income | 1,262,674 | 1,079,469 | 695,245
Net income attributable to CBRE Group, Inc. |  | 1,079,469 | 695,245
Nonguarantor Subsidiaries [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue | 10,344,086 |  |
Cost of revenue | 7,852,601 |  |
Operating, administrative and other | 1,728,136 |  |
Depreciation and amortization | 174,004 |  |
Total costs and expenses | 9,754,741 |  |
Gain on disposition of real estate | 385 |  |
Operating income | 589,730 |  |
Equity income (loss) from unconsolidated subsidiaries | (1,094) |  |
Other income (loss) | 21,065 |  |
Interest expense, net of interest income | 36,187 |  |
Royalty and management service (income) expense | 92,728 |  |
Income before provision for income taxes | 480,786 |  |
(Benefit of) provision for income taxes | 187,655 |  |
Net income | 293,131 |  |
Less: Net income attributable to non-controlling interests | 9,093 |  |
Net income attributable to CBRE Group, Inc. | 284,038 |  |
Nonguarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue |  | 9,341,619 | 7,926,782
Cost of revenue |  | 6,935,265 | 5,787,985
Operating, administrative and other |  | 1,624,944 | 1,413,446
Depreciation and amortization |  | 180,610 | 166,251
Total costs and expenses |  | 8,740,819 | 7,367,682
Gain on disposition of real estate |  | 7,169 | 13,791
Operating income |  | 607,969 | 572,891
Equity income (loss) from unconsolidated subsidiaries |  | 1,584 | 3,552
Other income (loss) |  | (10,638) | 9,382
Interest expense, net of interest income |  | (198,367) | 27,115
Royalty and management service (income) expense |  | 61,626 | (66,191)
Income before provision for income taxes |  | 735,656 | 624,901
(Benefit of) provision for income taxes |  | 154,607 | 154,388
Net income | $ 293,131 | 581,049 | 470,513
Less: Net income attributable to non-controlling interests |  | 2,729 | 6,467
Net income attributable to CBRE Group, Inc. |  | $ 578,320 | $ 464,046

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