Differentiation between Federal Statutory Tax Rate and Effective Tax Rate (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Rate Reconciliation [Line Items]
Statutory provision	35.00%	35.00%
State, [taxes], net of federal benefit	0.20%	0.60%
City taxes	0.10%
Foreign effective tax rates different from US statutory rate	(10.60%)	(11.80%)
Tax reserve	(1.60%)
Effective Income Tax Rate	23.10%	23.80%