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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | $ (12,188) | $ (8,969)
Other comprehensive income (loss) before reclassifications | 2,941 | 1,986
Amounts reclassified from accumulated other comprehensive income | (230) | (968)
Other Comprehensive Income, net of tax | 2,711 | 1,018
Ending balance | (9,477) | (7,951)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | 404 | 1,932
Other comprehensive income (loss) before reclassifications | 1,620 | 758
Amounts reclassified from accumulated other comprehensive income | (285) | (1,013)
Other Comprehensive Income, net of tax | 1,335 | (255)
Ending balance | 1,739 | 1,677
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, net of tax | 79 |
Ending balance | 79 |
Defined Benefit Plan Adjustments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | (5,017) | (3,895)
Amounts reclassified from accumulated other comprehensive income | 55 | 45
Other Comprehensive Income, net of tax | 55 | 45
Ending balance | (4,962) | (3,850)
Foreign Currency Adjustments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | (7,575) | (7,006)
Other comprehensive income (loss) before reclassifications | 1,242 | 1,228
Other Comprehensive Income, net of tax | 1,242 | 1,228
Ending balance | $ (6,333) | $ (5,778)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: 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=66004124&loc=SL7669686-108580 + 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=66004921&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=66004124&loc=SL7669686-108580 + Details
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