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Difference between Provision for Income Taxes and Amount Computed b Applying Federal (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Effective Tax Rate Reconciliation [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 5.30% 4.90% 5.50%
Foreign rate differences (8.60%) (2.70%) (1.10%)
Non-deductible expenses 5.50% 6.40% 2.80%
Other (1.00%) (1.60%) (2.70%)
Provision for income taxes 36.20% 42.00% 39.50%