Differentiation between Federal Statutory Tax Rate and Effective Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Rate Reconciliation [Line Items]
Statutory provision	35.00%	35.00%	35.00%	35.00%
State taxes, net of federal benefit	0.80%	0.50%	0.40%	0.20%
City taxes	0.10%		0.10%
Foreign effective tax rates different from US statutory rate	(15.30%)	(12.10%)	(14.00%)	(11.10%)
Tax reserve	0.00%	(1.40%)	(0.50%)	(0.50%)
Valuation Allowance	1.00%		1.00%
Effective Income Tax Rate	21.60%	22.00%	22.00%	23.60%