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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Dec. 31, 2018	May 01, 2018
Class of Stock [Line Items]
Additional shares issued	266,410	213,276
Shelf Registration [Member]
Class of Stock [Line Items]
Additional shares issued			0
Common Class A [Member]
Class of Stock [Line Items]
Issuance of shares related to acquisition				163,137
Common Class A [Member] | Equity Distribution Agreement [Member]
Class of Stock [Line Items]
Common stock, shares sold			842,412
Common stock, shares available to be sold	$ 336,668		$ 336,668
Common Class A [Member] | Maximum [Member]
Class of Stock [Line Items]
Aggregate offering price of common stock issuable					$ 400,000

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