XML 66 R56.htm IDEA: XBRL DOCUMENT v2.4.1.9
Nature of Operations - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Schedule Of Description Of Business [Line Items]  
Percentage of revenue generated by affiliates 46.00%cbg_PercentageOfRevenueGeneratedByContractualServices
Minimum [Member]  
Schedule Of Description Of Business [Line Items]  
Number of offices 370cbg_NumberOfOffices
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Number of employees 52,000dei_EntityNumberOfEmployees
/ us-gaap_RangeAxis
= us-gaap_MinimumMember