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Acquisitions (Second Quarter 2017) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
CMF Associates, LLC [Member]
Business Acquisition, Contingent Consideration [Line Items]
Effective date of acquisition	Jun. 01, 2017
Acquired entity, name	CMF Associates, LLC
Slaton Insurance [Member]
Business Acquisition, Contingent Consideration [Line Items]
Effective date of acquisition	Jun. 01, 2017
Acquired entity, name	Slaton Insurance

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
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-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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