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Long-term Borrowings - Additional Information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2020
Mar. 31, 2020
Dec. 31, 2017
Nov. 30, 2017
Jan. 31, 2017
Dec. 31, 2015
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt € 16,426 € 18,412              
Liabilities directly related to assets held for sale 3,386                
Interest expense related to long-term borrowings € 405 € 454 € 636            
Top of range [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt interest rate 12.00% 12.00%              
Bottom Of Range [Member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt interest rate 3.00% 3.00%              
Six-month Euribor (360) plus a 2.9% spread long-term debt with final payment due December 2020 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt maturity December 2020 December 2020              
Long-term debt interest rate basis Six-month Euribor (360) Six-month Euribor (360)              
Long-term debt interest rate spread 2.90% 2.90%              
Long-term debt   € 42              
Six-month Euribor (360) plus a 2.9% spread long-term debt with final payment due December 2020 [member] | Italian subsidiaries [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount                 € 200
Long-term debt maturity December 2020                
Long-term debt interest rate basis six-month Euribor (360)                
Long-term debt interest rate spread 2.90%                
Mortgage loan € 300                
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt maturity August 2021 August 2021              
Long-term debt interest rate basis Six-month Euribor (360) Six-month Euribor (360)              
Long-term debt interest rate spread 2.50% 2.50%              
Long-term debt € 3,920 € 4,601              
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member] | Top of range [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Net debt to EBITDA 300.00%                
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member] | Bottom Of Range [Member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Cash receipt turnover percentage 60.00%                
Earnings before interest, taxes, depreciation and amortization (EBITDA) percentage 4.50%                
Debt Service Cover Ratio 135.00%                
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member] | Romanian subsidiary [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount                 10,000
Long-term debt maturity August 2021                
Long-term debt interest rate basis six-month Euribor (360)                
Long-term debt interest rate spread 2.50%                
Mortgage loan € 16,628                
Long-term debt 3,920                
Long-term debt lump sum repayment € 3,194                
Three-month Euribor (360) plus a 4% spread long-term debt with final payment due September 2021 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount                 € 5,000
Long-term debt maturity September 2021 September 2021              
Long-term debt interest rate basis Three-month Euribor (360) Three-month Euribor (360)              
Long-term debt interest rate spread 4.00% 4.00%              
Long-term debt € 750 € 1,500              
Three-month Euribor (360) plus a 4% spread long-term debt with final payment due September 2021 [member] | Matera [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Mortgage loan € 10,000                
Three-month Euribor (360) plus a 4% spread long-term debt with final payment due September 2021 [member] | Top of range [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Earnings before interest, taxes, depreciation and amortization (EBITDA) percentage 200.00%                
Net financial position/equity 25.00%                
Three-month Euribor (360) plus a 2.2% spread long-term debt with final payment due August 2022 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt maturity August 2022 August 2022              
Long-term debt interest rate basis Three-month Euribor (360) Three-month Euribor (360)              
Long-term debt interest rate spread 2.20% 2.20%              
Long-term debt   € 428              
Three-month Euribor (360) plus a 2.2% spread long-term debt with final payment due August 2022 [member] | Italian subsidiaries [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount           € 1,000      
Long-term debt maturity August 2022                
Long-term debt interest rate basis three-month Euribor (360)                
Long-term debt interest rate spread 2.20%                
Liabilities directly related to assets held for sale € 344                
Three-month Euribor (360) plus a 3.5% spread long-term debt with final payment due June 2022 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount               € 2,500  
Long-term debt maturity June 2022 June 2022              
Long-term debt interest rate basis Three-month Euribor (360) Three-month Euribor (360)              
Long-term debt interest rate spread 3.50% 3.50%              
Long-term debt € 750 € 1,125              
Three-month Euribor (360) plus a 3.5% spread long-term debt with final payment due June 2022 [member] | Top of range [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Earnings before interest, taxes, depreciation and amortization (EBITDA) percentage 200.00%                
Net financial position/equity 25.00%                
Three-month Euribor (360) plus a 1.9% spread long-term debt with final payment due June 2023 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount             € 2,000    
Long-term debt maturity June 2023 June 2023              
Long-term debt interest rate basis Three-month Euribor (360) Three-month Euribor (360              
Long-term debt interest rate spread 1.90% 1.90%              
Long-term debt € 1,025 € 1,191              
2.3% fixed long-term debt with final payment due January 2026 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount € 7,000                
Long-term debt maturity January 2026 January 2026              
Long-term debt € 5,562 € 6,075              
Long-term debt interest rate 2.30% 2.30%              
2.3% fixed long-term debt with final payment due January 2026 [member] | Matera [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Mortgage loan € 14,000                
Six-months Euribor (360) plus a 2.75% spread long-term debt with final payment due December 2022 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt maturity December 2022 December 2022              
Long-term debt interest rate basis Six-month Euribor (360) Six-month Euribor (360)              
Long-term debt interest rate spread 2.75% 2.75%              
Long-term debt € 183                
Six-months Euribor (360) plus a 2.75% spread long-term debt with final payment due December 2022 [member] | Romanian subsidiary [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount     € 206            
Long-term debt maturity December 2022                
Long-term debt interest rate basis six-month Euribor (360)                
Long-term debt interest rate spread 2.75%                
Long-term debt € 183                
0.21% fixed long-term debt with final payment due December 2030 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount   € 4,181              
Long-term debt maturity December 2030 December 2030              
Mortgage loan € 13,936                
Long-term debt € 3,257 € 3,105              
Long-term debt interest rate 0.21% 0.21%              
80% of six-months Euribor (360) plus a 0.95% spread long-term debt with final payment due January 2035 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount   € 435              
Long-term debt maturity January 2035 January 2035              
Long-term debt interest rate basis six-month Euribor (360)                
Long-term debt interest rate spread 0.95% 0.95%              
Mortgage loan € 3,000                
Long-term debt € 287 € 345              
Long-term debt interest rate 80.00% 80.00%              
No interest rate long-term debt with final payment due September 2027 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt maturity September 2027 September 2027              
Long-term debt € 378                
Long-term debt interest rate 0.00% 0.00%              
No interest rate long-term debt with final payment due September 2027 [member] | Swiss subsidiary [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount         € 378        
Long-term debt maturity September 2027                
Long-term debt € 378                
Long-term debt interest rate 0.00%                
11.76% Fixed long-term debt with final payment due October 2023 [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt maturity October 2023 October 2023              
Long-term debt € 314                
Long-term debt interest rate 11.76% 11.76%              
11.76% Fixed long-term debt with final payment due October 2023 [member] | Brazilian subsidiary [member]                  
Disclosure Of Detailed Information About Borrowings [Line Items]                  
Long-term debt nominal amount       € 314          
Long-term debt maturity October 2023                
Long-term debt € 314                
Long-term debt interest rate 11.76%