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Fair Value of Financial Instruments - Summary of Contractual Maturities of Short and Long Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Amortized Cost Basis, Due within one year	$ 481,071	$ 416,932
Amortized Cost Basis, Due after 1 year and within 2 years	11,466	31,560
Amortized Cost	492,537	448,492
Aggregate Fair Value, Due within one year	480,761	416,663
Aggregate Fair Value, Due after 1 year and within 2 years	11,450	31,394
Aggregate Fair Value, Total	$ 492,211	$ 448,057

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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