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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 497,911 |
Other comprehensive income (loss) before reclassifications | 585 | $ 2,941
Amounts reclassified from accumulated other comprehensive income | 127 | (230)
Amounts reclassified to retained earnings | (3,220) |
Other Comprehensive Income (Loss), net of tax | (2,508) | 2,711
Ending Balance | 475,736 |
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 2,567 | 404
Other comprehensive income (loss) before reclassifications | (257) | 1,620
Amounts reclassified from accumulated other comprehensive income | 65 | (285)
Amounts reclassified to retained earnings | (3,220) |
Other Comprehensive Income (Loss), net of tax | (3,412) | 1,335
Ending Balance | (845) | 1,739
Unrealized Gains (Losses) on Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications |  | 79
Other Comprehensive Income (Loss), net of tax |  | 79
Ending Balance |  | 79
Defined Benefit Plan Adjustments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (4,286) | (5,017)
Amounts reclassified from accumulated other comprehensive income | 62 | 55
Other Comprehensive Income (Loss), net of tax | 62 | 55
Ending Balance | (4,224) | (4,962)
Foreign Currency Adjustments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (1,576) | (7,575)
Other comprehensive income (loss) before reclassifications | 842 | 1,242
Other Comprehensive Income (Loss), net of tax | 842 | 1,242
Ending Balance | (734) | (6,333)
Accumulated Other Comprehensive Income [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (3,295) | (12,188)
Ending Balance | $ (5,803) | $ (9,477)

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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