Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 324,871		$ 81,967
Gross Unrealized Losses	0		(6)
Fair Value	324,871		81,961
Cash and Cash Equivalents	324,371		75,105
Short-term investments	500		6,862
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			27,516
Gross Unrealized Losses			(6)
Fair Value			27,510
Cash and Cash Equivalents			20,884
Short-term investments			6,632
Fair Value, Inputs, Level 2 \| State and municipal obligations
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			992
Gross Unrealized Losses			0
Fair Value			992
Cash and Cash Equivalents			762
Short-term investments			230
Fair Value, Inputs, Level 2 \| Certificates of Deposit
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		$ 500
Gross Unrealized Losses		0
Fair Value		500
Cash and Cash Equivalents		0
Short-term investments		$ 500
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	120,539		53,459
Gross Unrealized Losses	0		0
Fair Value	120,539		53,459
Cash and Cash Equivalents	120,539		53,459
Short-term investments	0		0
Money market funds \| Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	203,832		20,884
Gross Unrealized Losses	0		0
Fair Value	203,832		20,884
Cash and Cash Equivalents	203,832		20,884
Short-term investments	$ 0		0
Corporate bonds \| Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost			6,632
Gross Unrealized Losses			(6)
Fair Value			6,626
Cash and Cash Equivalents			0
Short-term investments			$ 6,632

Cash cash equivalent and investments amortized cost.

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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