Employee Benefit Plans - Summary of Weighted-Average Assumptions Used to Determine Net Benefit Obligation (Detail) - Defined Benefit Pension Plans |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 3.80% | 4.50% | 3.70% |
| Long-term return on plan assets | 7.20% | 7.20% | 9.20% |