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Retirement Plans - Defined Benefit Plans - Reconciliation of Projected Benefit Obligation and Funded Status (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Change in Projected Benefit Obligation: | |||
| Benefit obligation at beginning of fiscal year | $ 78,701 | $ 81,944 | |
| Service cost | 5,747 | 6,613 | 7,082 |
| Interest cost | 3,678 | 3,115 | 2,876 |
| Actuarial (gain) loss | 17,493 | (10,472) | |
| Benefits paid | (2,922) | (2,499) | |
| Curtailment | 465 | 0 | 900 |
| Benefit obligation at end of fiscal year | 103,162 | 78,701 | 81,944 |
| Change in Plan Assets: | |||
| Plan assets at fair value at beginning of fiscal year | 53,470 | 51,528 | |
| Actual net return on plan assets | 4,065 | 4,052 | |
| Employer contributions | 7,965 | 389 | 10,700 |
| Benefits paid | (2,922) | (2,499) | |
| Plan assets at fair value at end of fiscal year | 62,578 | 53,470 | 51,528 |
| Unfunded projected benefit obligation recognized in other liabilities on the consolidated balance sheets | $ (40,584) | $ (25,231) | |