Notes Receivable - Summary of Activity in Loan Loss Reserve (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, net	$ 49,503	$ 42,534	$ 56,245
Gain on disposition of real estate, net of tax	$ 73,386	167,571	3,060
Aggregate write down in the loan loss reserve		15,606	$ 0
Sale of Note Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face value of note receivable sold, including accrued interest		9,800
Notes receivable, net		5,000
Proceeds from sale of notes receivable		7,900
Loan loss reserve		4,800
Gain on disposition of real estate, net of tax		2,900
Write off a cross collateralized note receivable, including accrued interest		10,800
Aggregate write down in the loan loss reserve		$ 15,600