Commitments and Contingencies - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Commitments and Contingencies Disclosure [Abstract] | |||
| Rent expense for operating leases | $ 23,800,000 | $ 21,800,000 | $ 19,200,000 |
| Exposure per occurrence, employees compensation | 250,000 | ||
| Aggregate self insured exposure per employer's liability | 500,000 | ||
| Exposure per occurrence | 500,000 | ||
| Aggregate self insured exposure per occurrence, foreign employees compensation | 100,000 | ||
| Aggregate self insured exposure per employer's liability, foreign | 1,000,000 | ||
| Auto liability claims | 100,000 | ||
| Gross self insurance accruals | 3,200,000 | 3,900,000 | |
| Related insurance recoveries | $ 1,900,000 | $ 1,500,000 | |
| Employment agreement, automatic renewal period | 1 year | ||
| Employment agreements, termination lump sum payments, period following change in control of company | 2 years | ||
| X | ||||||||||
- Definition Aggregate Self Insured Exposure Per Employer's Liability No definition available.
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| X | ||||||||||
- Definition Aggregate Self Insured Exposure Per Employer's Liability, Foreign No definition available.
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| X | ||||||||||
- Definition Aggregate Self Insured Exposure Per Occurrence No definition available.
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| X | ||||||||||
- Definition Aggregate Self Insured Exposure Per Occurrence, Employees Compensation No definition available.
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| X | ||||||||||
- Definition Aggregate Self Insured Exposure Per Occurrence, Foreign Employees Compensation No definition available.
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| X | ||||||||||
- Definition Auto Liability Insurance Claims Deductible No definition available.
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| X | ||||||||||
- Definition Other Commitments, Employment Agreement, Automatic Renewal Period No definition available.
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| X | ||||||||||
- Definition Other Commitments, Employment Agreements, Termination Lump Sum Payments, Period Following Change In Control Of Company No definition available.
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| X | ||||||||||
- Definition Self Insurance Accruals Gross No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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