Long-Term Employee Benefit Liabilities - Summary of Weighted Average Significant Actuarial Assumptions Adopted in Measuring Company's Obligations and Cost (Detail) - Pension Plan, Defined Benefit [Member]	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.10%	3.80%
Rate of compensation increase	2.30%	2.50%
Net periodic benefit cost Discount rate	3.20%	3.70%
Rate of compensation increase	2.40%	2.70%
Expected return on plan assets	5.80%	5.90%

Long-Term Employee Benefit Liabilities - Summary of Weighted Average Significant Actuarial Assumptions Adopted in Measuring Company's Obligations and Cost (Detail) - Pension Plan, Defined Benefit [Member]

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Defined Benefit Plan Disclosure [Line Items]

Discount rate

3.10%

3.80%

Rate of compensation increase

2.30%

2.50%

Net periodic benefit cost Discount rate

3.20%

3.70%

Rate of compensation increase

2.40%

2.70%

Expected return on plan assets

5.80%

5.90%