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Difference between Provision for Income Taxes and Amount Computed by Applying Federal Statutory Rates (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Effective Tax Rate Reconciliation [Line Items]      
Provision for federal income taxes at the statutory rate 21.00% 35.00% 35.00%
State and local income taxes, net of Federal income tax benefit 97.40% 6.10% 3.60%
Foreign rate differences (110.30%) 7.20% (7.90%)
Non-deductible expenses 228.50% 3.70% 3.40%
Tax Act- revaluation of net deferred tax assets and other 16.80% 27.70%  
Tax Act- transition tax 43.00% 3.10%  
Uncertain tax positions 302.80% 0.60%  
Research and development credit (18.50%)    
Federal return to provision (27.50%)    
Other 14.40% 0.40% (2.10%)
Provision for income taxes 567.60% 83.80% 32.00%