Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2017	Dec. 31, 2017
ASU No. 2014-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Percentage of total revenue subject to guidance	20.00%
Percentage of revenue related to commissions paid by third party insurance carriers	40.00%
Percentage of revenue related to commissions paid by third party ancillary insurance products	25.00%
Percentage of revenue from billing fees related to insurance contracts	35.00%
ASU No. 2016-02 \| Scenario, Forecast
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Undiscounted contractual cash payments remaining on leased properties		$ 16.8

Percentage of insurance contracts billing fees revenues subject to accounting guidance.

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Percentage of revenues subject to accounting guidance.

+ References

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- Definition

Percentage of third party ancillary insurance commission revenues subject to accounting guidance.

+ References

No definition available.

+ Details

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Percentage of third party insurance commission revenues subject to accounting guidance.

+ References

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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

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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