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Receivables - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
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 4,394,000for_LoanSecuredByRealEstatePrincipalAmountReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
Interest amount of loan received 49,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember