Equity - Summary of Common Stock Repurchases (Detail)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Schedule Of Share Repurchase Programs [Line Items]
Shares Purchased	3,764
January 1, 2019 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Shares Purchased	2,882
Closing Price on Date of Purchase | $ / shares	$ 6.65
August 20, 2019 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Shares Purchased	116
Closing Price on Date of Purchase | $ / shares	$ 5.60
September 18, 2019 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Shares Purchased	766
Closing Price on Date of Purchase | $ / shares	$ 6.24