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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2013 Practice_Groups | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Aug. 30, 2013 MMP [Member] | Jul. 26, 2013 MMP [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of practice groups | 3 |  |  |  |  |  |
Aggregate Purchase price consideration paid during transaction |  |  |  |  |  |  | $ 201,600,000
Number of Shares purchased from Westbury |  |  |  |  |  | 3.85 |
Percentage of Holding |  |  |  |  |  | 50.00% |
Common stock, per share amount |  |  |  |  |  | $ 6.65 |
Payment for acquisition of common stock | 26,468,000 | 5,716,000 | 9,513,000 |  |  | 25,700,000 |
Fees earned under administrative service agreement | 140,200,000 | 116,100,000 | 109,100,000 |  |  |  |
Intangible assets amortization period | 8 years 3 months 18 days |  |  | 2 years | 15 years |  |
Software purchased or developed, estimated useful life | 7 years |  |  |  |  |  |
Contract payment terms | 90 days |  |  |  |  |  |
Total personnel costs | 471,100,000 | 429,400,000 | 397,200,000 |  |  |  |
Total occupancy costs | $ 37,300,000 | $ 36,400,000 | $ 35,000,000 |  |  |  |
Shares vesting term | 4 years |  |  |  |  |  |

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