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Segment Information - Geographic Information on Property (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Long-Lived Assets by Geographical Areas [Line Items] |  |  |
Net property | $ 157,014 | $ 148,678 | $ 155,839
United States |  |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |  |
Net property | 91,730 | 84,675 | 88,368
China |  |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |  |
Net property | 11,641 | 11,732 | 13,504
Germany |  |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |  |
Net property | 9,350 | 7,919 | 7,596
Other |  |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |  |
Net property | $ 44,293 | $ 44,352 | $ 46,371

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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(13)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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