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Changes in Accumulated Other Comprehensive Loss - The Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | |||||||||||
| Income before provision for income taxes | $ 14,710 | $ 15,577 | $ 16,677 | ||||||||
| Provision for income taxes | 4,565 | 4,429 | 6,124 | ||||||||
| Net income | 2,317 | 1,431 | 2,589 | 3,808 | 4,096 | 3,047 | 2,615 | 1,390 | 10,145 | 11,148 | 10,553 |
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Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Prior Service Benefit [Member]
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | |||||||||||
| Income before provision for income taxes | 162 | ||||||||||
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Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Amortization of Actuarial Loss [Member]
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | |||||||||||
| Income before provision for income taxes | (1,048) | ||||||||||
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Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Pension and Other Postretirement Benefits Items [Member]
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | |||||||||||
| Income before provision for income taxes | (886) | ||||||||||
| Provision for income taxes | (313) | ||||||||||
| Net income | $ (573) | ||||||||||