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Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 16, 2020	May 01, 2018
Class of Stock [Line Items]
Additional shares issued	266,410
Shelf Registration [Member]
Class of Stock [Line Items]
Additional shares issued		0	0
Common Class A [Member]
Class of Stock [Line Items]
Issuance of shares related to acquisition				163,137
Common Class A [Member] | Stock Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 250,000,000
Stock repurchase program expiry date		Sep. 30, 2021
Stock repurchased during period		$ 0
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		$ 336,668,000
Common Class A [Member] | Maximum [Member]
Class of Stock [Line Items]
Aggregate offering price of common stock issuable						$ 400,000,000

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