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Workers' Compensation Claims - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Specified investment balances or other financial instruments	$ 159.0
Surety bonds and standby letters of credit	152.9
Balance in Chubb trust account	235.2	$ 166.6
Receivable from Chubb	13.2
Ecole Insurance Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Surplus from wholly owned subsidiary	10.8	$ 9.5
California [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Surety bonds and standby letters of credit	$ 147.2

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- Definition

Insurance Deposit As Security For Future Payment Obligations Under Workers Compensation Program

+ References

No definition available.

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- Definition

Specified investment balances.

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- Definition

Standby letters of credit and a surety bond.

+ References

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- Definition

Workers compensation claims receivable.

+ References

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- Definition

The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

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- 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.

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