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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | $ 219,776 | $ 209,434
Short-term investments | 219,776 | 209,434
Other assets | 42,390 | 37,883
Foreign Exchange Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - contracts | 3,434 | 168
Derivatives - liabilities | 343 | 6,198
Interest Rate Hedge [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - contracts | 8,539 | 6,179
Derivatives – interest rate hedge – non-current | 8,539 | 6,179
Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 6,004 | 6,255
Derivatives - contracts | 3,434 | 168
Total assets | 291,166 | 274,765
Derivatives - liabilities | 343 | 6,198
Cash and cash equivalents, including restricted cash | 37,598 | 37,681
Short-term investments | 219,776 | 209,434
Total current assets | 260,808 | 247,283
Other assets | 24,354 | 21,227
Total long-term assets | 30,358 | 27,482
Fair Value Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - contracts | 3,434 | 168
Derivatives - liabilities | 343 | 6,198
Fair Value Measurements, Recurring [Member] | Interest Rate Hedge [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives – interest rate hedge – non-current | 8,539 | 6,179
Money Market Funds [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 17,584 | 4,987
Restricted cash | 114 | 119
Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 14,552 | 2,100
Available-for-sale investments |  | 9,757
U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 2,244 |
Available-for-sale investments | 30,646 | 35,738
Bankers Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 2,107 | 5,330
Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 38,947 | 36,990
U.S. Treasury Obligations [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 28,208 | 28,078
Commercial Paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 32,057 | 13,750
Commercial Paper [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 13,283 | 30,475
Available-for-sale investments | 32,057 | 13,750
Corporate Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 71,971 | 77,821
Corporate Obligations [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 4,373 |
Available-for-sale investments | 71,971 | 77,821
Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 1,288 | 1,970
Municipal Bonds [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 1,288 | 1,970
Group Insurance Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 6,004 | 6,255
Group Insurance Contracts [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 6,004 | 6,255
Israeli Pension Assets [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Pension assets | 15,815 | 15,048
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 17,698 | 5,106
Cash and cash equivalents, including restricted cash | 17,698 | 5,106
Total current assets | 17,698 | 5,106
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Money Market Funds [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 17,584 | 4,987
Restricted cash | 114 | 119
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 6,004 | 6,255
Derivatives - contracts | 3,434 | 168
Total assets | 273,468 | 269,659
Derivatives - liabilities | 343 | 6,198
Cash and cash equivalents, including restricted cash | 19,900 | 32,575
Short-term investments | 219,776 | 209,434
Total current assets | 243,110 | 242,177
Other assets | 24,354 | 21,227
Total long-term assets | 30,358 | 27,482
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - contracts | 3,434 | 168
Derivatives - liabilities | 343 | 6,198
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Hedge [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives – interest rate hedge – non-current | 8,539 | 6,179
Significant Other Observable Inputs (Level 2) [Member] | Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 14,552 | 2,100
Available-for-sale investments |  | 9,757
Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 2,244 |
Available-for-sale investments | 30,646 | 35,738
Significant Other Observable Inputs (Level 2) [Member] | Bankers Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 2,107 | 5,330
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 38,947 | 36,990
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Obligations [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 28,208 | 28,078
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 13,283 | 30,475
Available-for-sale investments | 32,057 | 13,750
Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 4,373 |
Available-for-sale investments | 71,971 | 77,821
Significant Other Observable Inputs (Level 2) [Member] | Municipal Bonds [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 1,288 | 1,970
Significant Other Observable Inputs (Level 2) [Member] | Group Insurance Contracts [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investments | 6,004 | 6,255
Significant Other Observable Inputs (Level 2) [Member] | Israeli Pension Assets [Member] | Fair Value Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Pension assets | $ 15,815 | $ 15,048

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