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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, 2017
shares
February, 2013 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 19,786
Vesting conditions 15% first three anniversaries, 25% fourth anniversary, 30% fifth anniversary
Contractual life 5 years
February, 2015 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 13,709
Vesting conditions One-third every anniversary
Contractual life 3 years
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 anniversary, 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 10,920
Vesting conditions One-third every anniversary
Contractual life 3 years
June, 2015 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 4,912
Vesting conditions Third anniversary
Contractual life 3 years
June 2015 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 6,750
Vesting conditions 15% first three anniversaries, 25% fourth anniversary, 30% fifth anniversary
Contractual life 5 years
December, 2015 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 429
Vesting conditions Third anniversary
Contractual life 3 years
February, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 19,012
Vesting conditions One-third every anniversary
Contractual life 3 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 anniversary, 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 anniversary, 30% fifth anniversary
Contractual life 5 years
May, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 4,739
Vesting conditions One-third every anniversary
Contractual life 3 years
June, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 25,280
Vesting conditions One-third every anniversary
Contractual life 3 years
June, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 7,925
Vesting conditions Third anniversary
Contractual life 3 years
Sept, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 6,668
Vesting conditions Third anniversary
Contractual life 3 years
Sept, 2016 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of instruments 5,005
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 22,012
Vesting conditions One-third every anniversary
Contractual life 3 years
June, 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
June, 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