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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2016 USD ($) Reporting_Unit | Nov. 01, 2015 USD ($) | Dec. 31, 2016 USD ($) Practice_Groups Reporting_Unit | Dec. 31, 2015 USD ($) Reporting_Unit | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of practice groups | Practice_Groups |  |  |  | 3 |  |  |
Fees earned under administrative service agreement |  |  |  | $ 144,800,000 | $ 137,500,000 | $ 133,700,000 |
Maximum maturity period of investments |  |  |  | 3 months |  |  |
Allowance for doubtful accounts |  |  |  | $ 13,508,000 | 12,659,000 | 11,915,000 | $ 9,975,000
Software purchased or developed, estimated useful life |  |  |  | 7 years |  |  |
Goodwill |  |  |  | $ 487,484,000 | 447,685,000 | 435,231,000 |
Total assets |  |  |  | 1,118,588,000 | 996,331,000 |  |
Total stockholders' equity |  |  |  | $ 480,021,000 | $ 427,948,000 | 399,845,000 | 374,446,000
Number of reporting units | Reporting_Unit |  | 5 |  | 5 | 5 |  |
Goodwill, Impairment Loss |  | $ 0 | $ 0 |  |  |  |
Intangible assets amortization period |  |  |  | 7 years 7 months 6 days |  |  |
Shares vesting term |  |  |  | 4 years |  |  |
Unsecured credit facility |  |  |  | $ 400,000,000 |  |  |
Contract payment terms |  |  |  | 90 days |  |  |
Total personnel costs |  |  |  |  | $ 544,800,000 | 502,800,000 | $ 487,000,000
Total occupancy costs |  |  |  | $ 45,700,000 | 41,400,000 | $ 37,100,000 |
Deferred income taxes, net |  |  |  |  | 4,796,000 |  |
Net decrease other non-current assets |  |  |  | (2,006,000) | (2,031,000) |  |
Decrease of bank debt | [1] |  |  | $ (191,400,000) | (205,800,000) |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net decrease other non-current assets |  |  |  |  | 1,900,000 |  |
Decrease of bank debt |  |  |  |  | 1,900,000 |  |
Accounting Standards Update 2015-17 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net non-current deferred income tax liability that would have been recorded had a new standard been adopted |  |  |  |  | $ 100,000 |  |
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 |  |  |
[1] | See Note 1, Organization and Summary of Significant Accounting Policies, to the accompanying consolidated financial statements for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17.

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