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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period |  |  | $ 149,950 |
Other comprehensive income (loss) | $ 9,590 | $ (38,019) | 14,278 | $ (55,386)
Balance at end of period | 170,109 |  | 170,109 |
Marketable Securities |  |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | 2,394 | 39,968 | 195 | 47,112
Other comprehensive income (loss) | 6,983 | (34,513) | 9,182 | (41,657)
Balance at end of period | 9,377 | 5,455 | 9,377 | 5,455
Currency Translation |  |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (170,533) | (165,944) | (172,384) | (154,173)
Other comprehensive income (loss) | 1,777 | (3,538) | 3,628 | (15,309)
Balance at end of period | (168,756) | (169,482) | (168,756) | (169,482)
Interest Rate Swap |  |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (1,173) |  | (445) |
Other comprehensive income (loss) | 32 | (733) | (920) | (733)
Less reclassification adjustment for amounts included in interest expense | 113 |  | 337 |
Balance at end of period | (1,028) | (733) | (1,028) | (733)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (71,082) | (73,439) | (72,712) | (75,260)
Other comprehensive income (loss) | 817 | 902 | 2,447 | 2,723
Balance at end of period | (70,265) | (72,537) | (70,265) | (72,537)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (276) | 9 | (12) | 282
Other comprehensive income (loss) | (132) | (137) | (396) | (410)
Balance at end of period | (408) | (128) | (408) | (128)
Total Accumulated Other Comprehensive Loss |  |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (240,670) | (199,406) | (245,358) | (182,039)
Balance at end of period | $ (231,080) | $ (237,425) | $ (231,080) | $ (237,425)

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 + Details
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: 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 Reference 2: 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 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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