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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, shares in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 30, 2013 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) Practice_Groups Reporting_Unit | Nov. 01, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jul. 26, 2013 USD ($) | Dec. 31, 2012 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of practice groups | Practice_Groups |  | 3 |  |  |  |  |
Fees earned under administrative service agreement |  | $ 137,500,000 |  | $ 133,700,000 | $ 133,500,000 |  |
Maximum maturity period of investments |  | 3 years |  |  |  |  |
Restricted cash |  | $ 24,860,000 |  | 28,293,000 |  |  |
Allowance for doubtful accounts |  | 12,659,000 |  | 11,915,000 | 9,975,000 |  | $ 11,363,000
Funds held for clients |  | 171,497,000 |  | 182,847,000 |  |  |
Client fund obligations |  | $ 171,318,000 |  | 183,936,000 |  |  |
Software purchased or developed, estimated useful life |  | 7 years |  |  |  |  |
Property and equipment, net |  | $ 20,162,000 |  | 18,475,000 |  |  |
Goodwill and other intangible assets, net |  | 535,653,000 |  | 526,462,000 |  |  |
Total assets |  | 998,200,000 |  | 991,244,000 |  |  |
Total stockholders' equity |  | 427,948,000 |  | 399,845,000 | 374,446,000 |  | $ 295,232,000
Goodwill |  | 447,685,000 |  | 435,231,000 | 384,697,000 |  |
Goodwill, Impairment Loss |  | $ 0 | $ 0 |  |  |  |
Number of reporting units | Reporting_Unit |  | 5 |  |  |  |  |
Intangible assets amortization period |  | 7 years 9 months 18 days |  |  |  |  |
Shares vesting term |  | 4 years |  |  |  |  |
Contract payment terms |  | 90 days |  |  |  |  |
Total personnel costs |  | $ 502,800,000 |  | 487,000,000 | 459,800,000 |  |
Total occupancy costs |  | 41,400,000 |  | 37,100,000 | 36,000,000 |  |
Payment for acquisition of treasury stock |  | $ 36,482,000 |  | $ 28,137,000 | $ 26,468,000 |  |
MMP [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Aggregate Purchase price consideration paid during transaction | $ 201,600,000 |  |  |  |  | $ 201,600,000 |
Number of shares purchased from Westbury | shares | 3.9 |  |  |  |  |  |
Percentage of Holding | 50.00% |  |  |  |  |  |
Common stock, per share amount | $ / shares | $ 6.65 |  |  |  |  |  |
Payment for acquisition of treasury stock | $ 25,700,000 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period |  | 2 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period |  | 15 years |  |  |  |  |

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