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Workers' Compensation Claims - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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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 | 232.9 | $ 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 |

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- Definition Insurance Deposit As Security For Future Payment Obligations Under Workers Compensation Program + References No definition available. + Details
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- Definition Specified investment balances. + References No definition available. + Details
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- Definition Specified investment balances increase in surety bond requirement. + References No definition available. + Details
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- Definition Standby letters of credit and a surety bond. + References No definition available. + Details
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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. + References No definition available. + Details
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- Details
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