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Acquisitions (Fourth Quarter 2016) - Additional Information (Detail) - Actuarial Consultants Inc [Member]	12 Months Ended
	Dec. 31, 2018
Business Acquisition, Contingent Consideration [Line Items]
Effective date of acquisition	Nov. 01, 2016
Acquired entity, name	Actuarial Consultants, Inc

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460

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-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

Name of the acquired entity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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