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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) (USD $)
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9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | ||||
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Sep. 30, 2014
Office
Subsidiary
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Sep. 30, 2014
Maximum [Member]
Total revenues [Member]
Customer Concentration Risk [Member]
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Sep. 30, 2013
Maximum [Member]
Total revenues [Member]
Customer Concentration Risk [Member]
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Sep. 30, 2014
Maximum [Member]
Total revenues [Member]
Customer Concentration Risk [Member]
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Sep. 30, 2013
Maximum [Member]
Total revenues [Member]
Customer Concentration Risk [Member]
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Sep. 30, 2014
MMI [Member]
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Nov. 05, 2013
IPO [Member]
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Sep. 30, 2014
IPO [Member]
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Nov. 05, 2013
IPO [Member]
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| Class of Stock [Line Items] | |||||||||
| Number of offices in the United States and Canada | 78 | ||||||||
| Number of wholly owned subsidiaries | 2 | ||||||||
| Formation date | 2013-06 | ||||||||
| Contribution date | Oct. 30, 2013 | ||||||||
| Percentage of common stock distributed | 80.00% | ||||||||
| Common stock sold | 6,900,000 | ||||||||
| Common stock sold and issued under IPO, price per share | $ 12.00 | ||||||||
| Description of IPO | On November 5, 2013, MMI completed its Initial Public Offering ("IPO") of 6,900,000 shares of common stock at a price to the public of $12.00 per share. | ||||||||
| Concentration of credit risk percentage | 10.00% | 10.00% | 10.00% | 10.00% | |||||