Pension Plans - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost [Abstract] | |||
| Discount rate | 4.25% | 4.00% | 5.00% |
| Rate of compensation increase | 0.00% | 0.00% | 0.00% |
| Expected long-term return on plan assets | 8.00% | 8.00% | 8.00% |