Receivables - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due period of notes receivable as secured by deed of trust	3 years
Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amount of loan received	$ 4,394
Interest amount of loan received	$ 49