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Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ (10,603) | $ (14,891) | $ (28,298)
Other comprehensive income (loss) |  |  | 13,407
Other comprehensive income and other | 4,608 | 4,288 |
Ending Balance | (5,995) | (10,603) | (14,891)
Qualifying Cash Flow Hedging Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (41) | (419) | (468)
Other comprehensive income (loss) |  |  | 49
Other comprehensive income and other | 1,450 | 378 |
Ending Balance | 1,409 | (41) | (419)
Pension Adjustments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (12,160) | (15,850) | (29,888)
Other comprehensive income (loss) |  |  | 14,038
Other comprehensive income and other | 1,463 | 3,690 |
Ending Balance | (10,697) | (12,160) | (15,850)
Unrealized (Loss) Gain on Available for Sale Marketable Securities |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (416) | (463) | 0
Other comprehensive income (loss) |  |  | (463)
Other comprehensive income and other | 416 | 47 |
Ending Balance | 0 | (416) | (463)
Foreign Exchange Gain (Loss) on Currency Translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 2,014 | 1,841 | 2,058
Other comprehensive income (loss) |  |  | (217)
Other comprehensive income and other | 1,279 | 173 |
Ending Balance | $ 3,293 | $ 2,014 | $ 1,841

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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=84161450&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=96868048&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=96868048&loc=SL4569643-111683 + Details
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