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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Receivables (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Warehouse Receivables And Warehouse Lines Of Credit [Abstract] |  |
Beginning balance at January 1, 2017 | $ 1,276,047 |
Origination of mortgage loans | 11,441,884 | $ 9,917,310
Gains (premiums on loan sales) | 32,711 |
Sale of mortgage loans | (11,283,330) |
Cash collections of premiums on loan sales | (32,711) |
Proceeds from sale of mortgage loans | (11,316,041) | $ (10,075,850)
Net increase in mortgage servicing rights included in warehouse receivables | 309 |
Ending balance at September 30, 2017 | $ 1,434,910 |

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- Definition Reflects the gross carrying amount of unpaid loans pertaining to a revolving line of credit used by mortgage bankers in which the mortgage banker originates and purchases mortgage loans due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net increase in mortgage servicing rights included in warehouse receivables. + References No definition available. + Details
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Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sale of mortgage loans held for sale. + References No definition available. + Details
Name: | cbg_SaleOfMortgageLoansHeldForSale
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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- Definition Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Namespace Prefix: | us-gaap_
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- Definition The amount of cash paid for the origination of mortgages that are held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow from collection of repayments from borrowers on loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585 + Details
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- Definition The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585 + Details
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