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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 21, 2018 | Aug. 18, 2018 | Jul. 31, 2018 | Jul. 02, 2018 | Feb. 01, 2018 | Jan. 27, 2018 | Jan. 09, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,579,740,000 | $ 910,766,000 |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size | 2,300,000,000 | 3,000,000,000 |  |  |  |  |  |  |
Carrying Value | $ 1,579,740,000 | 910,766,000 |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.45%, maturing October 23, 2018 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Current Maturity | Oct. 23, 2018 |  |  |  |  |  |  |  |
Maximum Facility Size | $ 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |  |
Carrying Value | $ 870,446,000 | $ 192,180,000 |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.45% | 1.45% |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 23, 2018 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Current Maturity | Oct. 23, 2018 |  |  |  |  |  |  |  |
Maximum Facility Size | $ 25,000,000 | $ 25,000,000 |  |  |  |  |  |  |
Carrying Value |  | $ 5,800,000 |  |  |  |  |  |  |
Line of credit over LIBOR rate | 2.75% | 2.75% |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] | Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Current Maturity | Cancelable anytime |  |  |  |  |  |  |  |
Maximum Facility Size | $ 450,000,000 | $ 450,000,000 |  |  |  |  |  |  |
Carrying Value | $ 34,655,000 | $ 205,827,000 |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.35% | 1.35% |  |  |  |  |  |  |
Line of credit, LIBOR floor rate | 0.35% | 0.35% |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] | TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 30, 2019 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Current Maturity | Jun. 30, 2019 |  |  |  |  |  |  |  |
Maximum Facility Size | $ 400,000,000 | $ 800,000,000 | $ 625,000,000 |  | $ 800,000,000 |  | $ 400,000,000 |  |
Carrying Value | $ 296,487,000 | $ 225,416,000 |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.20% | 1.20% |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing June 4, 2019 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Current Maturity | Jun. 04, 2019 |  |  |  |  |  |  |  |
Maximum Facility Size | $ 225,000,000 | $ 337,500,000 |  | $ 225,000,000 |  | $ 337,500,000 |  | $ 225,000,000 |
Carrying Value | $ 220,348,000 | $ 130,443,000 |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.30% | 1.30% |  |  |  |  |  |  |
Warehouse Agreement Borrowings [Member] | Capital One [Member] | Pricing at daily one-month LIBOR plus 1.35%, maturing July 27, 2019 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Current Maturity | Jul. 27, 2019 |  |  |  |  |  |  |  |
Maximum Facility Size | $ 200,000,000 | $ 387,500,000 | $ 200,000,000 |  | $ 375,000,000 |  |  |  | $ 200,000,000
Carrying Value | $ 157,804,000 | $ 151,100,000 |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.35% | 1.35% |  |  |  |  |  |  |

X
- Definition Line of credit facility expiration term. + References No definition available. + Details
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Namespace Prefix: | cbg_
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Balance Type: | na
Period Type: | duration

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- Definition This element represents the minimum amount for the debt instrument's basis spread over the variable interest rate on a debt instrument. + References No definition available. + Details
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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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