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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,823,831 | $ 3,193,487 | $ 3,207,537 | $ 2,846,734 | $ 3,700,242 | $ 2,712,559 | $ 2,390,506 | $ 2,052,503 | $ 13,071,589 | $ 10,855,810 | $ 9,049,918
Cost of services |  |  |  |  |  |  |  |  | 9,123,727 | 7,082,932 | 5,611,262
Operating, administrative and other |  |  |  |  |  |  |  |  | 2,781,310 | 2,633,609 | 2,438,960
Depreciation and amortization |  |  |  |  |  |  |  |  | 366,927 | 314,096 | 265,101
Total costs and expenses |  |  |  |  |  |  |  |  | 12,271,964 | 10,030,637 | 8,315,323
Gain on disposition of real estate |  |  |  |  |  |  |  |  | 15,862 | 10,771 | 57,659
Operating (loss) income | 352,821 | 172,492 | 182,594 | 107,580 | 206,983 | 240,101 | 228,755 | 160,105 | 815,487 | 835,944 | 792,254
Equity income from unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 197,351 | 162,849 | 101,714
Other income (loss) |  |  |  |  |  |  |  |  | 4,688 | (3,809) | 12,183
Interest income |  |  |  |  |  |  |  |  | 8,051 | 6,311 | 6,233
Interest expense |  |  |  |  |  |  |  |  | 144,851 | 118,880 | 112,035
Write-off of financing costs on extinguished debt |  |  |  |  |  |  |  |  |  | 2,685 | 23,087
Income before provision for income taxes |  |  |  |  |  |  |  |  | 880,726 | 879,730 | 777,262
(Benefit of) provision for income taxes |  |  |  |  |  |  |  |  | 296,662 | 320,853 | 263,759
Net income |  |  |  |  |  |  |  |  | 584,064 | 558,877 | 513,503
Less: Net income attributable to non-controlling interests |  |  |  |  |  |  |  |  | 12,091 | 11,745 | 29,000
Net income (loss) attributable to CBRE Group, Inc. | $ 263,975 | $ 104,163 | $ 121,668 | $ 82,167 | $ 180,043 | $ 149,123 | $ 125,029 | $ 92,937 | 571,973 | 547,132 | 484,503
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | (178,499) | (316,475) | (222,733)
Interest expense |  |  |  |  |  |  |  |  | (178,499) | (316,475) | (222,733)
Income from consolidated subsidiaries |  |  |  |  |  |  |  |  | (1,419,922) | (1,339,488) | (1,100,923)
Income before provision for income taxes |  |  |  |  |  |  |  |  | (1,419,922) | (1,339,488) | (1,100,923)
Net income |  |  |  |  |  |  |  |  | (1,419,922) | (1,339,488) | (1,100,923)
Net income (loss) attributable to CBRE Group, Inc. |  |  |  |  |  |  |  |  | (1,419,922) | (1,339,488) | (1,100,923)
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating, administrative and other |  |  |  |  |  |  |  |  | 5,003 | 67,549 | 52,233
Total costs and expenses |  |  |  |  |  |  |  |  | 5,003 | 67,549 | 52,233
Operating (loss) income |  |  |  |  |  |  |  |  | (5,003) | (67,549) | (52,233)
Income from consolidated subsidiaries |  |  |  |  |  |  |  |  | 575,061 | 588,769 | 517,293
Income before provision for income taxes |  |  |  |  |  |  |  |  | 570,058 | 521,220 | 465,060
(Benefit of) provision for income taxes |  |  |  |  |  |  |  |  | (1,915) | (25,912) | (19,443)
Net income |  |  |  |  |  |  |  |  | 571,973 | 547,132 | 484,503
Net income (loss) attributable to CBRE Group, Inc. |  |  |  |  |  |  |  |  | 571,973 | 547,132 | 484,503
CBRE [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating, administrative and other |  |  |  |  |  |  |  |  | (8,231) | (23,833) | (906)
Total costs and expenses |  |  |  |  |  |  |  |  | (8,231) | (23,833) | (906)
Operating (loss) income |  |  |  |  |  |  |  |  | 8,231 | 23,833 | 906
Other income (loss) |  |  |  |  |  |  |  |  | 1 | 1 | 1
Interest income |  |  |  |  |  |  |  |  | 131,132 | 196,439 | 222,738
Interest expense |  |  |  |  |  |  |  |  | 184,738 | 234,180 | 101,309
Write-off of financing costs on extinguished debt |  |  |  |  |  |  |  |  |  | 2,685 | 23,087
Income from consolidated subsidiaries |  |  |  |  |  |  |  |  | 603,071 | 598,996 | 454,989
Income before provision for income taxes |  |  |  |  |  |  |  |  | 557,697 | 582,404 | 554,238
(Benefit of) provision for income taxes |  |  |  |  |  |  |  |  | (17,364) | (6,365) | 36,945
Net income |  |  |  |  |  |  |  |  | 575,061 | 588,769 | 517,293
Net income (loss) attributable to CBRE Group, Inc. |  |  |  |  |  |  |  |  | 575,061 | 588,769 | 517,293
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,671,793 | 5,817,752 | 4,892,760
Cost of services |  |  |  |  |  |  |  |  | 4,635,426 | 3,782,705 | 3,094,211
Operating, administrative and other |  |  |  |  |  |  |  |  | 1,454,777 | 1,349,874 | 1,173,045
Depreciation and amortization |  |  |  |  |  |  |  |  | 225,552 | 173,741 | 130,672
Total costs and expenses |  |  |  |  |  |  |  |  | 6,315,755 | 5,306,320 | 4,397,928
Gain on disposition of real estate |  |  |  |  |  |  |  |  | 3,669 | 3,859 | 7,003
Operating (loss) income |  |  |  |  |  |  |  |  | 359,707 | 515,291 | 501,835
Equity income from unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 192,811 | 161,404 | 95,271
Other income (loss) |  |  |  |  |  |  |  |  | (89) | 1,483 | 3,661
Interest income |  |  |  |  |  |  |  |  | 50,272 | 122,260 | 2,159
Interest expense |  |  |  |  |  |  |  |  | 97,815 | 137,281 | 158,030
Royalty and management service (income) expense |  |  |  |  |  |  |  |  | (39,182) | (27,445) | (24,758)
Income from consolidated subsidiaries |  |  |  |  |  |  |  |  | 241,790 | 151,723 | 128,641
Income before provision for income taxes |  |  |  |  |  |  |  |  | 785,858 | 842,325 | 598,295
(Benefit of) provision for income taxes |  |  |  |  |  |  |  |  | 182,787 | 243,329 | 143,306
Net income |  |  |  |  |  |  |  |  | 603,071 | 598,996 | 454,989
Net income (loss) attributable to CBRE Group, Inc. |  |  |  |  |  |  |  |  | 603,071 | 598,996 | 454,989
Nonguarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,399,796 | 5,038,058 | 4,157,158
Cost of services |  |  |  |  |  |  |  |  | 4,488,301 | 3,300,227 | 2,517,051
Operating, administrative and other |  |  |  |  |  |  |  |  | 1,329,761 | 1,240,019 | 1,214,588
Depreciation and amortization |  |  |  |  |  |  |  |  | 141,375 | 140,355 | 134,429
Total costs and expenses |  |  |  |  |  |  |  |  | 5,959,437 | 4,680,601 | 3,866,068
Gain on disposition of real estate |  |  |  |  |  |  |  |  | 12,193 | 6,912 | 50,656
Operating (loss) income |  |  |  |  |  |  |  |  | 452,552 | 364,369 | 341,746
Equity income from unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 4,540 | 1,445 | 6,443
Other income (loss) |  |  |  |  |  |  |  |  | 4,776 | (5,293) | 8,521
Interest income |  |  |  |  |  |  |  |  | 5,146 | 4,087 | 4,069
Interest expense |  |  |  |  |  |  |  |  | 40,797 | 63,894 | 75,429
Royalty and management service (income) expense |  |  |  |  |  |  |  |  | 39,182 | 27,445 | 24,758
Income before provision for income taxes |  |  |  |  |  |  |  |  | 387,035 | 273,269 | 260,592
(Benefit of) provision for income taxes |  |  |  |  |  |  |  |  | 133,154 | 109,801 | 102,951
Net income |  |  |  |  |  |  |  |  | 253,881 | 163,468 | 157,641
Less: Net income attributable to non-controlling interests |  |  |  |  |  |  |  |  | 12,091 | 11,745 | 29,000
Net income (loss) attributable to CBRE Group, Inc. |  |  |  |  |  |  |  |  | $ 241,790 | $ 151,723 | $ 128,641

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