Indebtedness - Defaults on Recourse Indebtedness - Additional Information (Detail)		3 Months Ended
	Aug. 20, 2019	Mar. 31, 2019
Subsequent Event
Debt Instrument [Line Items]
Time period to take remedy action to avoid default	60 days
Default stated interest rate	0.50%
7.125% Senior Notes
Debt Instrument [Line Items]
Default stated interest rate		7.125%
Default maturity date		Aug. 30, 2019
7.125% Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Default stated interest rate	7.125%
7.625% Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Default stated interest rate	7.625%