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Workers' Compensation Claims - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Balance in Chubb trust account | $ 380,600,000 | $ 277,100,000 |  |
Specified investment balances or other financial instruments | 96,800,000 | 135,000,000 |  |
Surety bonds and standby letters of credit | 96,800,000 |  |  |
Estimated future liability for unsettled workers' compensation | 363,517,000 | 312,537,000 | $ 255,675,000 | $ 225,278,000
Reserves incurred in excess of retention limits | 3,000,000 | 9,100,000 |  |
Other Assets [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Accrual for costs incurred in excess of retention limits offset by a receivable | 3,000,000 | $ 9,100,000 |  |
California [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Surety bonds and standby letters of credit | 84,800,000 |  |  |
Barrett Business Services Inc [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Worker's compensation risk claim maximum | $ 5,000,000 |  |  |

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