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Financed Lease Receivables - Future Minimum Lease Payments under Non-Cancelable Sales-Type Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Future minimum lease payments under non-cancelable sales-type leases    
2015 $ 2,828us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableCurrent  
2016 568us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears  
2017 93us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears  
2018 0us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInFourYears  
Total minimum future lease payments $ 3,489us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived $ 5,462us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived