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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Employee contribution to Company's profit sharing plan percentage 1.00%    
Employee contribution to Company's profit sharing plan percentage 50.00%    
Minimum age limit for specified additional amount 50 years    
Company's contributions $ 6,093 $ 5,651 $ 6,524
Bonus expense 38,254 46,783 28,097
Supplemental retirement benefits cost 4,609 3,478 $ 1,805
Accumulated benefit obligation 20,644 15,929  
Defined benefit plan expected company contributions $ 1,046    
Expected long-term rate of return on assets 1.90%    
Defined benefit plan, vested benefit obligations $ 17,552 17,932  
Israel [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets $ 14,409 15,048  
Japan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 1.50%    
United Kingdom [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 2.60%    
France [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 1.60%    
Germany [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets $ 5,890 $ 6,255  
Germany [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets guaranteed rate of return 2.25%    
Germany [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets guaranteed rate of return 4.25%