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Discontinued Operations and Divestitures - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |  | 144 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 Operations | Dec. 31, 2011 Business | Dec. 31, 2013 MMP [Member] | Jul. 26, 2013 MMP [Member] | Dec. 31, 2011 Individual Wealth Management Business [Member] | Dec. 31, 2012 National Practices [Member] | Dec. 31, 2011 Financial Services Practice Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount related to credit facility debt |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |
Aggregate Purchase price consideration paid during transaction |  |  |  |  |  |  |  |  |  |  |  |  | 201,600,000 |  |  |
Gains recorded related to contingent proceeds | 93,000 | 56,315,000 | 1,905,000 | 23,000 | 18,000 | 32,000 | 18,000 | 22,000 | 58,336,000 | 90,000 | 14,000 |  |  |  | 100,000 |
Discontinued Operations, Number of Operations Sold |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Reduction in goodwill balance as part of sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  | 300,000
Business sold by the parent company |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Business sold by parent company |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Gain from the sale of its individual wealth management business |  |  |  |  |  |  |  |  | 100,000 | 2,800,000 | 2,900,000 |  |  |  |  |
Cash received from sale of business and client list | $ 100,000 |  |  |  | $ 1,400,000 |  |  |  | $ 100,000 | $ 1,400,000 | $ 900,000 |  |  |  |  |

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