Pension Plans - Weighted-Average Assumptions Used to Determine Benefit Obligations (Detail) |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract] | ||
| Discount rate | 4.25% | 4.25% |
| Rate of compensation increase | 0.00% | 0.00% |