Allowance for Credit Losses and Credit Quality - Financing Receivables by Portfolio Segment by Impairment Evaluation Method (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: Individually evaluated for impairment
Allowance for credit losses: Collectively evaluated for impairment	15,534		14,038
Allowance for credit losses: Contracts acquired with deteriorated credit quality
Allowance for credit losses, Ending balance	15,534	15,576	14,038	13,359	13,030	13,180
Financing receivables: Individually evaluated for impairment
Financing receivables: Collectively evaluated for impairment	177,424		173,871
Financing receivables: Contracts acquired with deteriorated credit quality
Financing receivables, Ending balance	177,424		173,871
Lease-Comm Microticket Equipment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: Individually evaluated for impairment
Allowance for credit losses: Collectively evaluated for impairment	98		103
Allowance for credit losses: Contracts acquired with deteriorated credit quality
Allowance for credit losses, Ending balance	98	108	103	111	126	162
Financing receivables: Individually evaluated for impairment
Financing receivables: Collectively evaluated for impairment	188		174
Financing receivables: Contracts acquired with deteriorated credit quality
Financing receivables, Ending balance	188		174
Time-Payment Microticket Equipment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: Individually evaluated for impairment
Allowance for credit losses: Collectively evaluated for impairment	15,436		13,935
Allowance for credit losses: Contracts acquired with deteriorated credit quality
Allowance for credit losses, Ending balance	15,436	15,468	13,935	13,248	12,904	13,018
Financing receivables: Individually evaluated for impairment
Financing receivables: Collectively evaluated for impairment	177,236		173,697
Financing receivables: Contracts acquired with deteriorated credit quality
Financing receivables, Ending balance	$ 177,236		$ 173,697