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Workers' Compensation Claims - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Specified investment balances or other financial instruments	$ 158.2
Balance in ACE trust account	190.2	$ 166.6
California [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Surety bonds and standby letters of credit	152.0
Increasing Company's surety deposit requirement	$ 147.2

X

- Definition

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

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No definition available.

+ Details

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X

- Definition

Specified investment balances.

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No definition available.

+ Details

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X

- Definition

Specified investment balances increase in surety bond requirement.

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No definition available.

+ Details

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X

- Definition

Standby letters of credit and a surety bond.

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No definition available.

+ Details

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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.

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No definition available.

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