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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 487,484 | $ 447,685
Additions | 40,940 | 39,799
Goodwill | 528,424 | 487,484
Financial Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 271,330 | 267,485
Additions | 35,531 | 3,845
Goodwill | 306,861 | 271,330
Benefits and Insurance Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 214,488 | 178,534
Additions | 5,409 | 35,954
Goodwill | 219,897 | 214,488
National Practices [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 1,666 | 1,666
Goodwill | $ 1,666 | $ 1,666

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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