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Components of Net Periodic Benefit Cost (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2006 | Dec. 31, 2002
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined benefit plan age of attainment | 21 years |  |
Service period for employees of coverage age, years (at least) | 1 year |  |
Defined benefit plan, percentage vested | 100.00% |  |
Retiree benefits eliminated if less than service period, years (less than) |  | 10 years | 10 years
Defined benefit plan, contributions by employer | $ 0 |  |

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