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Long-term Borrowings - Summary of Detailed Information About Loans Outstanding (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2018
0.74% long-term debt payable in annual installments with final payment due April 2018 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate 0.74%
Long-term debt maturity April 2018
6-months Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2019 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate basis 6-months Euribor (360)
Long-term debt interest rate spread 2.50%
Long-term debt maturity August 2019
6-months Euribor (360) plus a 3.9% spread long-term debt with final payment due August 2019 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate basis 6-months Euribor (360)
Long-term debt interest rate spread 3.90%
Long-term debt maturity August 2019
3-months Euribor (360) plus a 4% spread long-term debt with final payment due August 2019 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate basis 3-months Euribor (360)
Long-term debt interest rate spread 4.00%
Long-term debt maturity August 2019
6-months 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 interest rate basis 6-months Euribor (360)
Long-term debt interest rate spread 2.90%
Long-term debt maturity December 2020
3-months Euribor (360) plus a 3,5% spread long-term debt with final payment due March 2022 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate basis 3-months Euribor (360)
Long-term debt interest rate spread 3.50%
Long-term debt maturity March 2022
3-months Euribor (360) plus a 2.2% spread long-term debt with final payment due February 2022 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate basis 3-months Euribor (360)
Long-term debt interest rate spread 2.20%
Long-term debt maturity February 2022
3-months Euribor (360) plus a 1.9% spread long-term debt with final payment due November 2022 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate basis 3-months Euribor (360)
Long-term debt interest rate spread 1.90%
Long-term debt maturity November 2022
2.3% long-term debt with final payment due June 2025 [member]  
Disclosure of detailed information about borrowings [line items]  
Long-term debt interest rate 2.30%
Long-term debt maturity June 2025