Redeemable Preferred Stocks - Summary of Redeemable Preferred Stock (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders Equity [Line Items]
Accumulated dividends	$ 30,729	$ 26,840	$ 23,443
Series E Redeemable Preferred Stock [Member]
Stockholders Equity [Line Items]
Beginning balance	$ 202,169
Beginning balance, shares	139,768
Accretion relating to liquidation preference on preferred stock	$ 1,067
Accretion for discount and issuance costs on preferred stock	928
Accumulated dividends	30,729	26,840	$ 23,443
Ending balance	$ 234,893	$ 202,169
Ending balance, shares	139,768	139,768
Series F Redeemable Preferred Stock [Member]
Stockholders Equity [Line Items]
Beginning balance, shares	1
Ending balance, shares	1	1