Pension Plan and Life Insurance Contract - Assumptions to Determine Company's Benefit Obligation (Detail) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Compensation and Retirement Disclosure [Abstract] | |||
| Discount rate | 2.15% | 1.82% | 3.25% |
| Rate of compensation increase | 0.00% | 1.75% | 1.75% |
| Measurement Date | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 |