Equity - Summary of Class A Common Stock Issuances (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	9 Months Ended
		May 31, 2013	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Shares issued		25,875,000	10,001,429	10,842,295
Net proceeds			$ 311,955	$ 278,322
Class A Common Stock [Member]
Class of Stock [Line Items]
Shares issued			10,000,000
Gross per share issue price			$ 31.45
Net per share issue price			$ 31.24
Net proceeds	[1]		$ 311,955

[1] Net proceeds represents proceeds received from the underwriters less applicable transaction costs.