Receivables - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and Notes Receivables	$ 23,893	$ 24,847
Due period of notes receivable as secured by deed of trust	3 years
Funds held by qualified intermediary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and Notes Receivables	$ 14,703	0
Area of Land | a	6,915
Loan secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and Notes Receivables	$ 0	3,574
Principal amount of loan received	4,394
Interest amount of loan received	49
Other loans secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and Notes Receivables	$ 2,130	$ 1,737