Employee Benefits - Schedule of Assumptions Used to Determine Defined Benefit Plans in Relation to Postemployment Benefits (Detail) - Postemployment Benefit Plans [Member] - Employee Severance Indemnity Provision [Member] |
Dec. 31, 2015 |
|---|---|
| Defined Benefit Plan Disclosure [Line Items] | |
| Annual Discount Rate | 1.39% |
| Annual Rate of Inflation | 1.75% |
| Annual Increase Rate | 2.81% |
| Probability of Employee Leaving Group | 10.00% |
| Probability of Advance Payment of TFR | 3.00% |