Retirement Plans - Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company (Detail) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
USD ($)
| |
| Compensation and Retirement Disclosure [Abstract] | |
| Expected Benefit Payments to Participants, 2016 | $ 1,104 |
| Expected Benefit Payments to Participants, 2017 | 983 |
| Expected Benefit Payments to Participants, 2018 | 974 |
| Expected Benefit Payments to Participants, 2019 | 845 |
| Expected Benefit Payments to Participants, 2020 | 731 |
| Expected Benefit Payments to Participants, 2021-2025 | 3,490 |
| Estimated Company Contributions, 2016 | 1,104 |
| Estimated Company Contributions, 2017 | 983 |
| Estimated Company Contributions, 2018 | 974 |
| Estimated Company Contributions, 2019 | 845 |
| Estimated Company Contributions, 2020 | 731 |
| Estimated Company Contributions, 2021-2025 | $ 3,490 |