Differentiation between Federal Statutory Tax Rate and Effective Tax Rate (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Rate Reconciliation [Line Items]
Statutory provision	35.00%	35.00%	35.00%	35.00%
State taxes, net of federal benefit	0.70%	0.10%	0.50%	0.20%
City taxes		0.10%		0.10%
Foreign effective tax rates different from US statutory rate	(12.10%)	(15.90%)	(12.40%)	(13.30%)
Tax reserve			0.10%	(0.80%)
Valuation Allowance		2.10%	0.60%	1.00%
Effective Income Tax Rate	23.60%	21.40%	23.80%	22.20%