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Share-based Payments - Summary of Terms and Conditions, Relating to the Grants of the Non-vested Stock Award under the Equity Compensation Plan (Detail)
12 Months Ended
Dec. 31, 2020
shares
April, 2015 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 4,915
Vesting conditions 15% first three anniversaries 25% fourth 30% fifth anniversary
Contractual life 5 years
June, 2015 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 5,839
Vesting conditions 15% first three anniversaries 25% fourth 30% fifth anniversary
Contractual life 5 years
February, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 147,000
Vesting conditions 15% first three anniversaries 25% fourth 30% fifth anniversary
Contractual life 5 years
February, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 63,000
Vesting conditions Fifth anniversary
Contractual life 5 years
May, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 7,899
Vesting conditions 15% first three anniversaries 25% fourth 30% fifth anniversary
Contractual life 5 years
February, 2017 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 22,012
Vesting conditions One-third every anniversary
Contractual life 3 years
February, 2018 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 21,556
Vesting conditions 7% first month 31% first three anniversaries
Contractual life 3 years
February, 2018 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 14,379
Vesting conditions 33% first three anniversaries
Contractual life 3 years
February, 2018 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 1,316
Vesting conditions 15% first three anniversaries 25% fourth 30% fifth anniversary
Contractual life 5 years
July, 2018 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 6,104
Vesting conditions Third anniversary
Contractual life 3 years
February, 2017 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 11,980
Vesting conditions One-third every anniversary
Contractual life 3 years
February, 2017 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 2,237
Vesting conditions Third anniversary
Contractual life 3 years
February, 2019 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 15,951
Vesting conditions 1% first month 33% first three anniversaries
Contractual life 3 years
June, 2019 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 9,256
Vesting conditions 33% first three anniversaries
Contractual life 3 years
June, 2019 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 977
Vesting conditions 33% first three anniversaries
Contractual life 3 years
August, 2019 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 1,039
Vesting conditions 33% first three anniversaries
Contractual life 3 years
December, 2019 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 1,724
Vesting conditions 100% first anniversary
Contractual life 1 year
February, 2020 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 24,650
Vesting conditions 1% first month 33% first three anniversaries
Contractual life 3 years
December, 2020 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 3,551
Vesting conditions 100% first anniversary
Contractual life 1 year