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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Statement of Income Captions [Line Items] |  |  |  |
Revenue | $ 3,549,977 | $ 3,193,487 | $ 9,873,396 | $ 9,247,758
Cost of services | 2,513,377 | 2,252,783 | 6,919,018 | 6,520,629
Operating, administrative and other | 704,898 | 686,530 | 2,023,503 | 2,010,338
Depreciation and amortization | 102,591 | 92,725 | 297,014 | 269,987
Total costs and expenses | 3,320,866 | 3,032,038 | 9,239,535 | 8,800,954
Gain on disposition of real estate | 6,180 | 11,043 | 18,863 | 15,862
Operating income | 235,291 | 172,492 | 652,724 | 462,666
Equity income from unconsolidated subsidiaries | 67,834 | 24,672 | 158,236 | 116,902
Other income (loss) | 1,768 | 1,356 | 9,069 | 8,453
Interest income | 3,129 | 1,020 | 6,967 | 5,545
Interest expense | 34,483 | 37,273 | 103,923 | 109,050
Income before provision for income taxes | 273,539 | 162,267 | 723,073 | 484,516
(Benefit of) provision for income taxes | 76,178 | 51,414 | 195,813 | 165,578
Net income | 197,361 | 110,853 | 527,260 | 318,938
Less: Net income attributable to non-controlling interests | 1,044 | 6,690 | 4,181 | 10,940
Net income attributable to CBRE Group, Inc. | 196,317 | 104,163 | 523,079 | 307,998
Eliminations [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Interest income | (30,651) | (33,550) | (91,250) | (99,119)
Interest expense | (30,651) | (33,550) | (91,250) | (99,119)
Income from consolidated subsidiaries | (495,075) | (275,915) | (1,282,248) | (729,665)
Income before provision for income taxes | (495,075) | (275,915) | (1,282,248) | (729,665)
Net income | (495,075) | (275,915) | (1,282,248) | (729,665)
Net income attributable to CBRE Group, Inc. | (495,075) | (275,915) | (1,282,248) | (729,665)
Parent [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Operating, administrative and other | 770 | 1,165 | 1,532 | 3,358
Total costs and expenses | 770 | 1,165 | 1,532 | 3,358
Operating income | (770) | (1,165) | (1,532) | (3,358)
Income from consolidated subsidiaries | 196,791 | 104,881 | 524,024 | 310,069
Income before provision for income taxes | 196,021 | 103,716 | 522,492 | 306,711
(Benefit of) provision for income taxes | (296) | (447) | (587) | (1,287)
Net income | 196,317 | 104,163 | 523,079 | 307,998
Net income attributable to CBRE Group, Inc. | 196,317 | 104,163 | 523,079 | 307,998
Guarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Revenue | 1,774,112 | 1,611,836 | 5,046,641 | 4,751,526
Cost of services | 1,256,664 | 1,149,943 | 3,504,306 | 3,304,291
Operating, administrative and other | 374,966 | 353,420 | 1,078,709 | 1,061,778
Depreciation and amortization | 60,610 | 54,423 | 176,035 | 165,087
Total costs and expenses | 1,692,240 | 1,557,786 | 4,759,050 | 4,531,156
Gain on disposition of real estate | 5,315 |  | 5,543 | 3,659
Operating income | 87,187 | 54,050 | 293,134 | 224,029
Equity income from unconsolidated subsidiaries | 65,439 | 24,287 | 154,769 | 114,504
Other income (loss) | 455 | 278 | 1,481 | (203)
Interest income | 1,352 | 592 | 3,891 | 2,163
Interest expense | 22,660 | 24,921 | 67,276 | 74,331
Royalty and management service (income) expense | (4,389) | (2,972) | (11,088) | (26,740)
Income from consolidated subsidiaries | 99,222 | 65,474 | 227,120 | 107,849
Income before provision for income taxes | 235,384 | 122,732 | 624,207 | 400,751
(Benefit of) provision for income taxes | 36,322 | 17,172 | 93,103 | 89,004
Net income | 199,062 | 105,560 | 531,104 | 311,747
Net income attributable to CBRE Group, Inc. | 199,062 | 105,560 | 531,104 | 311,747
Nonguarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Revenue | 1,775,865 | 1,581,651 | 4,826,755 | 4,496,232
Cost of services | 1,256,713 | 1,102,840 | 3,414,712 | 3,216,338
Operating, administrative and other | 328,406 | 332,103 | 941,619 | 946,786
Depreciation and amortization | 41,981 | 38,302 | 120,979 | 104,900
Total costs and expenses | 1,627,100 | 1,473,245 | 4,477,310 | 4,268,024
Gain on disposition of real estate | 865 | 11,043 | 13,320 | 12,203
Operating income | 149,630 | 119,449 | 362,765 | 240,411
Equity income from unconsolidated subsidiaries | 2,395 | 385 | 3,467 | 2,398
Other income (loss) | 1,313 | 1,078 | 7,587 | 8,655
Interest income | 1,777 | 428 | 3,076 | 3,382
Interest expense | 8,897 | 11,093 | 26,810 | 30,413
Royalty and management service (income) expense | 4,389 | 2,972 | 11,088 | 26,740
Income before provision for income taxes | 141,829 | 107,275 | 338,997 | 197,693
(Benefit of) provision for income taxes | 41,563 | 35,111 | 107,696 | 78,904
Net income | 100,266 | 72,164 | 231,301 | 118,789
Less: Net income attributable to non-controlling interests | 1,044 | 6,690 | 4,181 | 10,940
Net income attributable to CBRE Group, Inc. | 99,222 | 65,474 | 227,120 | 107,849
CBRE Services [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Operating, administrative and other | 756 | (158) | 1,643 | (1,584)
Total costs and expenses | 756 | (158) | 1,643 | (1,584)
Operating income | (756) | 158 | (1,643) | 1,584
Other income (loss) |  |  | 1 | 1
Interest income | 30,651 | 33,550 | 91,250 | 99,119
Interest expense | 33,577 | 34,809 | 101,087 | 103,425
Income from consolidated subsidiaries | 199,062 | 105,560 | 531,104 | 311,747
Income before provision for income taxes | 195,380 | 104,459 | 519,625 | 309,026
(Benefit of) provision for income taxes | (1,411) | (422) | (4,399) | (1,043)
Net income | 196,791 | 104,881 | 524,024 | 310,069
Net income attributable to CBRE Group, Inc. | $ 196,791 | $ 104,881 | $ 524,024 | $ 310,069

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