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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue | $ 21,340,088 | $ 18,628,787 | $ 17,369,108
Cost of services | 16,449,212 | 14,305,099 | 13,420,911
Operating, administrative and other | 3,365,773 | 2,858,720 | 2,780,301
Depreciation and amortization | 451,988 | 406,114 | 366,927
Total costs and expenses | 20,266,973 | 17,569,933 | 16,568,139
Gain on disposition of real estate | 14,874 | 19,828 | 15,862
Operating income | 1,087,989 | 1,078,682 | 816,831
Equity income from unconsolidated subsidiaries | 324,664 | 210,207 | 197,351
Other income (loss) | 93,020 | 9,405 | 4,688
Interest income | 8,585 | 9,853 | 8,051
Interest expense | 107,270 | 136,814 | 144,851
Write-off of financing costs on extinguished debt | 27,982 |  |
Income before provision for income taxes | 1,379,006 | 1,171,333 | 882,070
(Benefit of) provision for income taxes | 313,058 | 467,757 | 296,900
Net income | 1,065,948 | 703,576 | 585,170
Less: Net income attributable to non-controlling interests | 2,729 | 6,467 | 12,091
Net income attributable to CBRE Group, Inc. | 1,063,219 | 697,109 | 573,079
Eliminations [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Interest income | (347,259) | (143,425) | (178,499)
Interest expense | (347,259) | (143,425) | (178,499)
Income from consolidated subsidiaries | (2,740,635) | (1,857,622) | (1,423,076)
Income before provision for income taxes | (2,740,635) | (1,857,622) | (1,423,076)
Net income | (2,740,635) | (1,857,622) | (1,423,076)
Net income attributable to CBRE Group, Inc. | (2,740,635) | (1,857,622) | (1,423,076)
Parent [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Operating, administrative and other | 24,523 | 5,661 | 5,003
Total costs and expenses | 24,523 | 5,661 | 5,003
Operating income | (24,523) | (5,661) | (5,003)
Income from consolidated subsidiaries | 1,081,643 | 700,608 | 576,167
Income before provision for income taxes | 1,057,120 | 694,947 | 571,164
(Benefit of) provision for income taxes | (6,099) | (2,162) | (1,915)
Net income | 1,063,219 | 697,109 | 573,079
Net income attributable to CBRE Group, Inc. | 1,063,219 | 697,109 | 573,079
CBRE Services [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Operating, administrative and other | 1,156 | 1,972 | (8,231)
Total costs and expenses | 1,156 | 1,972 | (8,231)
Operating income | (1,156) | (1,972) | 8,231
Other income (loss) | 1 | 1 | 1
Interest income | 134,259 | 143,425 | 131,132
Interest expense | 102,228 | 132,777 | 184,738
Write-off of financing costs on extinguished debt | 27,982 |  |
Income from consolidated subsidiaries | 1,079,469 | 695,245 | 604,177
Income before provision for income taxes | 1,082,363 | 703,922 | 558,803
(Benefit of) provision for income taxes | 720 | 3,314 | (17,364)
Net income | 1,081,643 | 700,608 | 576,167
Net income attributable to CBRE Group, Inc. | 1,081,643 | 700,608 | 576,167
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue | 11,998,469 | 10,702,005 | 10,169,361
Cost of services | 9,513,947 | 8,517,114 | 8,133,496
Operating, administrative and other | 1,773,860 | 1,485,605 | 1,454,435
Depreciation and amortization | 271,378 | 239,863 | 225,552
Total costs and expenses | 11,559,185 | 10,242,582 | 9,813,483
Gain on disposition of real estate | 7,705 | 6,037 | 3,669
Operating income | 446,989 | 465,460 | 359,547
Equity income from unconsolidated subsidiaries | 323,080 | 206,655 | 192,811
Other income (loss) | 103,657 | 22 | (89)
Interest income | 6,805 | 5,453 | 50,272
Interest expense | 328,638 | 115,947 | 97,815
Royalty and management service (income) expense | (111,883) | 15,950 | (39,182)
Income from consolidated subsidiaries | 579,523 | 461,769 | 242,732
Income before provision for income taxes | 1,243,299 | 1,007,462 | 786,640
(Benefit of) provision for income taxes | 163,830 | 312,217 | 182,463
Net income | 1,079,469 | 695,245 | 604,177
Net income attributable to CBRE Group, Inc. | 1,079,469 | 695,245 | 604,177
Nonguarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Revenue | 9,341,619 | 7,926,782 | 7,199,747
Cost of services | 6,935,265 | 5,787,985 | 5,287,415
Operating, administrative and other | 1,566,234 | 1,365,482 | 1,329,094
Depreciation and amortization | 180,610 | 166,251 | 141,375
Total costs and expenses | 8,682,109 | 7,319,718 | 6,757,884
Gain on disposition of real estate | 7,169 | 13,791 | 12,193
Operating income | 666,679 | 620,855 | 454,056
Equity income from unconsolidated subsidiaries | 1,584 | 3,552 | 4,540
Other income (loss) | (10,638) | 9,382 | 4,776
Interest income | 214,780 | 4,400 | 5,146
Interest expense | 23,663 | 31,515 | 40,797
Royalty and management service (income) expense | 111,883 | (15,950) | 39,182
Income before provision for income taxes | 736,859 | 622,624 | 388,539
(Benefit of) provision for income taxes | 154,607 | 154,388 | 133,716
Net income | 582,252 | 468,236 | 254,823
Less: Net income attributable to non-controlling interests | 2,729 | 6,467 | 12,091
Net income attributable to CBRE Group, Inc. | $ 579,523 | $ 461,769 | $ 242,732

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