Employee Benefit Plans - Schedule of Pension Plan Weighted Average Asset Allocations (Detail) - Pension Benefits [Member]	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	100.00%	100.00%
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	100.00%	100.00%
Non-United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	58.44%	57.43%
Equity Securities [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	69.86%	70.09%
Equity Securities [Member] | Non-United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	47.92%	46.09%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	19.71%	19.39%
Debt Securities [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	25.21%	24.94%
Debt Securities [Member] | Non-United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	14.65%	14.42%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	2.36%	2.35%
Real Estate [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	4.93%	4.97%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	19.49%	20.83%
Other [Member] | Non-United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined pension plan weighted average asset allocations	37.43%	39.49%