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Financial instruments - aggregate accounts receivable, net of allowance for doubtful accounts (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivatives Fair Value [Line Items] |  |  |
Accounts receivable, net |  | $ 271,993 | $ 262,416
Spain, Italy, Portugal, and Greece |  |  |
Derivatives Fair Value [Line Items] |  |  |
Accounts receivable, net |  | $ 51,098 | $ 62,272
Percentage of total net current and long-term trade accounts receivables |  | 19.30% | 23.90%
Subsequent Event | Italy |  |  |
Derivatives Fair Value [Line Items] |  |  |
Receivables sold | $ 16,100 |  |
Proceeds from sale of receivables | $ 16,000 |  |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + 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(3)) -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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of any significant sales of financing receivables during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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