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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
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 528,424	$ 487,484
Additions	36,089	40,940
Divestitures	(213)
Goodwill	564,300	528,424
Financial Services [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	306,861	271,330
Additions	22,978	35,531
Divestitures	(213)
Goodwill	329,626	306,861
Benefits and Insurance Services [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	219,897	214,488
Additions	13,111	5,409
Goodwill	233,008	219,897
National Practices [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	1,666	1,666
Goodwill	$ 1,666	$ 1,666

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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