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Financial instruments - aggregate accounts receivable, net of allowance for doubtful accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Derivatives Fair Value [Line Items] |  |
Allowance for doubtful accounts | $ 9,348 | $ 10,255
Current portion of allowance for doubtful accounts | 4,400 | 3,500
Concentration Countries Greece, Italy, Spain And Portugal [Member] |  |
Derivatives Fair Value [Line Items] |  |
Accounts receivable, net | $ 39,026 | $ 49,054
Entity wide by country, percentage | 11.00% | 14.60%
Spain, Italy, Portugal, and Greece |  |
Derivatives Fair Value [Line Items] |  |
Long-term portion of trade accounts receivable, net from customers | $ 2,700 | $ 3,300
Italy |  |
Derivatives Fair Value [Line Items] |  |
Receivables sold | 12,700 |
Portugal |  |
Derivatives Fair Value [Line Items] |  |
Receivables sold | $ 12,600 |

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(9)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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