Reconciliation of Income Tax Provision Computed at Federal Statutory Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Effect of:
State and local taxes, net of federal tax effect	2.90%	2.20%	2.50%
Foreign tax rates	(1.20%)	(1.60%)	(1.20%)
Other	(1.40%)	0.70%	0.30%
Effective tax rate	35.30%	36.30%	36.60%