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Difference between Provision for Income Taxes and Amount Computed by Applying Federal Statutory Rates (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Effective Tax Rates Line Items      
Provision for federal income taxes at the statutory rate 35.00% 35.00% 35.00%
State and local income taxes, net of Federal income tax benefit 5.50% 3.20% 6.40%
Foreign rate differences (1.10%) (1.80%)  
Non-deductible stock options     0.10%
Non-deductible expenses 2.80% 1.20% 3.40%
Valuation allowance     (8.20%)
Reduction of deferred tax liabilities related to the prior year   (11.60%)  
Other (2.70%) (0.10%) (0.30%)
Provision for income taxes 39.50% 25.90% 36.40%