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Investments - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 139,746		$ 62,510
Proceeds received in connection with term loan amendment	100,000	$ 300,000
Investments	20,312		30,053
Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investments	$ 20,300		30,100
Investment maturity	One year or less
Money Market Funds [Member] | Level 1 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 123,000		$ 55,600

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