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Related-Party Transactions - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Sep. 30, 2014
Mr. Marcus [Member]
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Oct. 31, 2013
Dividend Paid [Member]
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Sep. 30, 2013
Dividend Paid [Member]
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Sep. 30, 2013
Dividend Declared [Member]
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Sep. 30, 2014
MMC [Member]
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Sep. 30, 2013
MMC [Member]
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Sep. 30, 2014
MMC [Member]
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Sep. 30, 2013
MMC [Member]
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Sep. 30, 2013
MMC [Member]
Shared Services [Member]
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Sep. 30, 2013
MMC [Member]
Shared Services [Member]
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Sep. 30, 2014
MMC [Member]
Transition Services Agreement [Member]
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Sep. 30, 2014
MMC [Member]
Transition Services Agreement [Member]
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Dec. 31, 2013
MMC [Member]
Transition Services Agreement [Member]
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| Related Party Transaction [Line Items] | ||||||||||||||||||
| Health insurance premium expense | $ 1,000,000 | $ 2,800,000 | $ 0 | $ 1,000,000 | ||||||||||||||
| General and administrative expense | 112,000 | 501,000 | 493,000 | 896,000 | 42,000 | 229,000 | ||||||||||||
| Transition services agreement effective date | Oct. 31, 2013 | |||||||||||||||||
| Accounts payable and other accrued expenses - related party | 172,000 | 172,000 | 506,000 | 172,000 | 172,000 | 506,000 | ||||||||||||
| Real estate brokerage commissions and financing fees from transactions with former parent, Marcus & Millichap Company | 872,000 | 0 | 932,000 | 382,000 | ||||||||||||||
| Commission expenses for transactions with former parent, Marcus & Millichap Company | 540,000 | 0 | 576,000 | 238,000 | ||||||||||||||
| Rent expense | 109,000 | 109,000 | 328,000 | 289,000 | ||||||||||||||
| Lease expires date | Apr. 30, 2015 | |||||||||||||||||
| Percentage of ownership in diluted shares | 67.00% | |||||||||||||||||
| Dividends to former parent, Marcus & Millichap Company | 31,181,000 | 6,500,000 | 31,181,000 | |||||||||||||||
| Preferred dividends declared but not paid | 6,500,000 | |||||||||||||||||
| Interest income earned from MMC | 0 | 74,000 | ||||||||||||||||
| Sweep arrangement termination date | Jun. 30, 2013 | |||||||||||||||||
| Aggregate principal amount outstanding for employee notes receivable | $ 419,000 | $ 419,000 | $ 418,000 | |||||||||||||||