Employee Benefit and Retirement Plans - Summary of Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Effective discount rate for benefit obligations	3.76%	4.06%	4.00%
Effective rate for interest on benefit obligations	3.07%	3.21%	4.00%
Effective rate for service cost	3.25%	4.16%	4.00%
Effective rate for interest on service cost	3.02%	3.67%	4.00%
Pension Benefits [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Effective discount rate for benefit obligations	3.98%	4.06%	4.00%
Effective rate for interest on benefit obligations	3.28%	3.21%	4.00%
Effective rate for service cost	3.83%	4.16%	4.00%
Effective rate for interest on service cost	3.38%	3.67%	4.00%
Long-term rate of return on plan assets	6.02%	6.34%	7.25%
Long-term rate of compensation increase	2.50%	2.50%	2.50%
Pension Benefits [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Effective discount rate for benefit obligations	2.12%	3.29%	3.03%
Effective rate for interest on benefit obligations	1.72%	2.92%	3.03%
Effective rate for service cost	2.44%	3.39%	3.03%
Effective rate for interest on service cost	2.38%	3.35%	3.03%
Long-term rate of return on plan assets	2.61%	3.93%	3.86%
Long-term rate of compensation increase	3.53%	3.51%	3.60%