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Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Pension and Other Postretirement Benefits Recognized in Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Deferred taxes | $ (11,582) | $ (12,297) | $ (7,269)
Defined Benefit Pension Plans |  |  |
Schedule of Pension and Other Postretirement Benefits Recognized in Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Prior service cost | 656 | 888 |
Total recognized in other comprehensive (income) loss before tax | 656 | 888 |
Deferred taxes | 321 | 236 |
Total recognized in other comprehensive income (loss), net of tax | 977 | 1,124 |
Post-Retirement Benefit Plans |  |  |
Schedule of Pension and Other Postretirement Benefits Recognized in Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Prior service cost | (3,427) | (4,025) |
Total recognized in other comprehensive (income) loss before tax | (3,427) | (4,025) |
Deferred taxes | (445) | (227) |
Total recognized in other comprehensive income (loss), net of tax | $ (3,872) | $ (4,252) |

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