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Marketable Securities and Fair Value Measurements - Fair Value Measured On A Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 30, 2018	Dec. 31, 2017
Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	$ 98,460		$ 272,031
Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	9,112		39,948
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short term notes receivable			4,476
Assets measured at fair value	552,456		581,947
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short term notes receivable			0
Assets measured at fair value	450,811		313,735
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short term notes receivable			0
Assets measured at fair value	101,645		263,736
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short term notes receivable		$ 4,900	4,476
Assets measured at fair value			4,476
Money market funds | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	431,081		253,155
Money market funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	431,081		253,155
Money market funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	0		0
Money market funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds			0
Commercial paper | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	17,793		58,502
Commercial paper | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	4,681		7,246
Commercial paper | Fair Value, Measurements, Recurring | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	17,793		58,502
Commercial paper | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	0		0
Commercial paper | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0		0
Commercial paper | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	4,681		7,246
Commercial paper | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	17,793		58,502
Commercial paper | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds			0
Commercial paper | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	2,195
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	2,195
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	0
Corporate bonds | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	3,880		2,016
Corporate bonds | Fair Value, Measurements, Recurring | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	45,052		145,557
Corporate bonds | Fair Value, Measurements, Recurring | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	4,960		24,993
Corporate bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	0		0
Corporate bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0		0
Corporate bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0		0
Corporate bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	3,880		2,016
Corporate bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	45,052		145,557
Corporate bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	4,960		24,993
Corporate bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds			0
Corporate bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
Corporate bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
Debt Security, Government, Non-US [Member] | Fair Value, Measurements, Recurring | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	1,407
U.S. government agency bonds | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	19,904		3,006
U.S. government agency bonds | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	1,407		14,955
U.S. government agency bonds | Fair Value, Measurements, Recurring | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	19,904		3,006
U.S. government agency bonds | Fair Value, Measurements, Recurring | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			14,955
U.S. government agency bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0		0
U.S. government agency bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0		0
U.S. government agency bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	19,904		3,006
U.S. government agency bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	1,407		14,955
U.S. government agency bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
U.S. government agency bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
Israeli funds | Fair Value, Measurements, Recurring | Other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	3,047		3,075
Israeli funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	0		0
Israeli funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	3,047		3,075
Israeli funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets			0
Municipal Securities | Fair Value, Measurements, Recurring | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	501
Municipal Securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0
Municipal Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	501
Asset-backed Securities | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	501
Asset-backed Securities | Fair Value, Measurements, Recurring | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			60,580
Asset-backed Securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			60,580
Asset-backed Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
Certificates of Deposit | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	420		4,386
Certificates of Deposit | Fair Value, Measurements, Recurring | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	420		4,386
Certificates of Deposit | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0		0
Certificates of Deposit | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	420		4,386
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments			0
U.S. Government Treasury Bonds | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	15,291		$ 60,580
U.S. Government Treasury Bonds | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	2,244
U.S. Government Treasury Bonds | Fair Value, Measurements, Recurring | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	15,291
U.S. Government Treasury Bonds | Fair Value, Measurements, Recurring | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	2,244
U.S. Government Treasury Bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	15,291
U.S. Government Treasury Bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	2,244
U.S. Government Treasury Bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0
U.S. Government Treasury Bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Long Term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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