Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs (Detail) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Compensation And Retirement Disclosure [Abstract] | ||
| Discount rate | 4.04% | 4.21% |
| Rate of compensation increase | 3.00% | 3.00% |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The interest rate used to adjust for the time value of money. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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