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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Office | Sep. 30, 2015 | Sep. 30, 2016 USD ($) Office | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |
Number of offices in the United States and Canada | Office |  |  | 81 |
Formation date |  |  | 2013-06 |
Percentage of common stock distributed |  |  | 80.00% |
IPO completion date |  |  | Oct. 30, 2013 |
Commission's receivable settled period |  |  | 10 days |
Operating lease obligations | $ | $ 77.1 |  | $ 77.1 |
Geographic Concentration Risk [Member] | Real Estate Brokerage Commissions Revenue [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Concentration risk percentage | 10.90% |  | 10.10% |
Number of offices | 1 | 0 | 1 | 0
Geographic Concentration Risk [Member] | Real Estate Brokerage Commissions Revenue [Member] | Minimum [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Concentration risk percentage |  | 10.00% |  | 10.00%
Customer Concentration Risk [Member] | Total revenues [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00% | 10.00%
Customer Concentration Risk [Member] | Commissions receivable [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00% | 10.00%
International Revenues [Member] | Geographic Concentration Risk [Member] | Total revenues [Member] | Maximum [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Concentration risk percentage |  |  | 1.00% |

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