Allowance for Credit Losses and Credit Quality - Aged Analysis of Past Due Financing Receivables by Our Internally Developed Proprietary Scoring Model in Leases (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 159,023		$ 147,802
31 to 60 Days Past Due	5,703		5,932
61 to 90 Days Past Due	4,366		4,162
Over 90 Days Past Due	17,478		19,752
Ending balance, financing receivables	186,570	[1]	177,648	[1]
Over 90 Days Accruing	17,478		19,752
Current	85.20%		83.20%
31 to 60 Days Past Due	3.10%		3.30%
61 to 90 Days Past Due	2.30%		2.40%
Over 90 Days Past Due	9.40%		11.10%
Percentage Of Financing Receivables	100.00%		100.00%
Lease Comm
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	80		93
31 to 60 Days Past Due	4		5
61 to 90 Days Past Due	4		4
Over 90 Days Past Due	58		83
Ending balance, financing receivables	146		185
Over 90 Days Accruing	58		83
Time Payment Corp
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	158,943		147,709
31 to 60 Days Past Due	5,699		5,927
61 to 90 Days Past Due	4,362		4,158
Over 90 Days Past Due	17,420		19,669
Ending balance, financing receivables	186,424		177,463
Over 90 Days Accruing	17,420		19,669
Time Payment Corp | Gold
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	69,719		58,769
31 to 60 Days Past Due	2,465		2,501
61 to 90 Days Past Due	889		902
Over 90 Days Past Due	2,040		3,391
Ending balance, financing receivables	75,113		65,563
Over 90 Days Accruing	2,040		3,391
Time Payment Corp | Silver
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	79,308		81,152
31 to 60 Days Past Due	2,553		2,933
61 to 90 Days Past Due	2,837		2,754
Over 90 Days Past Due	12,122		13,437
Ending balance, financing receivables	96,820		100,276
Over 90 Days Accruing	12,122		13,437
Time Payment Corp | Bronze
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,916		7,788
31 to 60 Days Past Due	681		493
61 to 90 Days Past Due	636		502
Over 90 Days Past Due	3,258		2,841
Ending balance, financing receivables	14,491		11,624
Over 90 Days Accruing	$ 3,258		$ 2,841

[1] Total financing receivables include net investment in leases. For purposes of asset quality and allowance calculations, the allowance for credit losses is excluded.