Employee Benefit Plans - Summary of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Credit) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Defined Benefit Pension Plans
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.50%	3.60%	4.20%
Long-term return on plan assets	7.50%	10.00%	10.00%
Foreign Pension Plan Defined Benefit
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	3.80%	3.70%	4.90%
Long-term return on plan assets	5.00%	5.00%	5.20%
Increase in future compensation levels	2.70%	3.10%	3.10%