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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Equity [Abstract] |  |
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount | $ (347) | $ 2,656
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit | 90 | (1,036)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount | (257) | 1,620
Unrealized gains (losses) on cash flow hedges, Before-Tax Amount |  | 79
Unrealized gains (losses) on cash flow hedges, Net-of-Tax Amount |  | 79
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Before-Tax Amount | 73 | (469)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit | (8) | 184
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount | 65 | (285)
Reclassification adjustment for amounts reclassed to retained earnings related to the adoption of ASU 2016-01, Before-Tax Amount | (3,220) |
Reclassification adjustment for amounts reclassed to retained earnings related to the adoption of ASU 2016-01, Net-of-Tax Amount | (3,220) |
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount | 90 | 80
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit | (28) | (25)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount | 62 | 55
Foreign currency translation adjustment, Before-Tax Amount | 842 | 1,242
Foreign currency translation adjustment, Net-of-Tax Amount | 842 | 1,242
Total Other Comprehensive Income (Loss), Before-Tax Amount | (2,562) | 3,588
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit | 54 | (877)
Other Comprehensive Income (Loss), net of tax | $ (2,508) | $ 2,711

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- Definition Amount before tax, after 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 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 + Details
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- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82918529&loc=d3e30304-110892 Reference 2: 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=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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