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Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | $ 149,950 |  |
Other comprehensive income (loss) | 12,512 | $ (63,319) | $ (147,023)
Balance at end of year | 177,920 | 149,950 |
Marketable Securities |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | 195 | 47,112 | 154,169
Other comprehensive income (loss) | 20,278 | (48,647) | (107,057)
Reclassification adjustment for amounts included in realized loss and equity in earnings |  | 1,730 |
Balance at end of year | 20,473 | 195 | 47,112
Currency Translation |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (172,384) | (154,173) | (133,816)
Other comprehensive income (loss) | (3,475) | (18,211) | (20,357)
Balance at end of year | (175,859) | (172,384) | (154,173)
Interest Rate Swap | Kronos |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (445) |  |
Other comprehensive income (loss) | (393) | (560) |
Reclassification adjustment for amounts included in realized loss and equity in earnings | 448 | 115 |
Balance at end of year | (390) | (445) |
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (72,712) | (75,260) | (56,644)
Other comprehensive income (loss) | 2,655 | 2,884 | 2,107
Net actuarial gain (loss) arising during year | (6,653) | (336) | (20,723)
Balance at end of year | (76,710) | (72,712) | (75,260)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (12) | 282 | 1,275
Other comprehensive income (loss) | (529) | (547) | (626)
Net actuarial gain (loss) arising during year | 181 | 253 | (367)
Balance at end of year | (360) | (12) | 282
Total Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |
Components Of Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (245,358) | (182,039) | (35,016)
Balance at end of year | $ (232,846) | $ (245,358) | $ (182,039)

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- Definition Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 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=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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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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