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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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