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Subsequent Events - Additional Information (Detail) (USD $)
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9 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||
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Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2013
2013 Omnibus Equity Incentive Plan [Member]
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Sep. 30, 2013
Tax-sharing agreement [Member]
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Sep. 30, 2013
Employee Stock Purchase Plan [Member]
2013 Omnibus Equity Incentive Plan [Member]
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Sep. 30, 2013
Deferred stock units [Member]
Age
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Sep. 30, 2013
Deferred stock units [Member]
2013 Omnibus Equity Incentive Plan [Member]
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Sep. 30, 2013
Millichap [Member]
Deferred stock units [Member]
2013 Omnibus Equity Incentive Plan [Member]
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Sep. 30, 2013
Non-employee directors [Member]
Restricted common stock [Member]
2013 Omnibus Equity Incentive Plan [Member]
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Sep. 30, 2013
Preferred Stock [Member]
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Sep. 30, 2013
Minimum [Member]
Deferred stock units [Member]
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Dec. 31, 2013
Minimum [Member]
Expected result [Member]
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Sep. 30, 2013
Maximum [Member]
Deferred stock units [Member]
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Dec. 31, 2013
Maximum [Member]
Expected result [Member]
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Sep. 30, 2013
IPO [Member]
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Sep. 30, 2013
IPO MMI [Member]
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Sep. 30, 2013
IPO Underwriters [Member]
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Sep. 30, 2013
IPO Selling Stockholder [Member]
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Sep. 30, 2013
All Other IPO Expenses [Member]
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| Subsequent Event [Line Items] | |||||||||||||||||||
| Common stock sold and issued under IPO | 6,900,000 | 4,173,413 | 900,000 | 2,726,587 | |||||||||||||||
| Common stock sold and issued under IPO, price per share | $ 12.00 | ||||||||||||||||||
| Net offering proceeds | $ 42,701,000 | ||||||||||||||||||
| IPO related expenses | 3,506,000 | 3,874,000 | |||||||||||||||||
| Percentage of common stock distributed | 80.00% | ||||||||||||||||||
| Preferred stock, shares authorized | 25,000 | ||||||||||||||||||
| Preferred stock, par value | $ 0.0001 | ||||||||||||||||||
| Percentage of tax-sharing agreement | 43.50% | ||||||||||||||||||
| Agreement termination date | Oct. 31, 2013 | ||||||||||||||||||
| Maximum percentage of deferred stock units settled | 20.00% | ||||||||||||||||||
| Deferred stock units, vesting period | 5 years | 3 years | 5 years | ||||||||||||||||
| Employee termination age | 67 | ||||||||||||||||||
| Percentage of deferred stock units settled | 100.00% | ||||||||||||||||||
| Percentage of shares of deferred stock units released from resale restriction | 100.00% | ||||||||||||||||||
| Estimate of stock-comp expense range | $ 30,000 | $ 35,000 | |||||||||||||||||
| Common stock shares reserved for issuance of awards | 5,500,000 | 366,667 | |||||||||||||||||
| Shares available for grant under the Plan | 234,489 | 233,739 | 2,192,409 | 83,333 | 30,000 | ||||||||||||||
| Provisions under equity incentive Plan | In connection with the IPO, MMI issued the following equity awards: (A) DSUs for an aggregate of 2,192,409 shares granted as replacement awards to the MMREIS managing directors, (B) DSUs for 83,333 shares to be granted to Mr. Millichap, and (C) 30,000 shares of restricted stock to the non-employee directors, in each case, based on the IPO price of $12.00. | ||||||||||||||||||