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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 5,651 | $ 6,524 | $ 2,667
Bonus expense | 46,783 | 28,097 | 14,599
Supplemental retirement benefits cost | 3,478 | 1,805 | $ 1,704
Accumulated benefit obligation | 15,929 | 12,450 |
Defined benefit plan assets | 8,152 |  |
Defined benefit plan, vested benefit obligations | 17,932 | 16,224 |
Defined benefit plan expected future benefit payments | $ 2,283 |  |
Expected long-term rate of return on assets | 1.90% |  |
Israel [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets | $ 15,048 | 13,910 |
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 | $ 6,255 | $ 5,558 |
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% |  |

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