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	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 153,792	$ 147,802
31 to 60 Days Past Due	5,093	5,932
61 to 90 Days Past Due	3,878	4,162
Over 90 Days Past Due	17,359	19,752
Financing receivables, Ending balance	180,122	177,648
Over 90 Days Accruing	17,359	19,752
Percent of total financing receivables, Current	85.40%	83.20%
Percent of total financing receivables, 31 to 60 Days Past Due	2.80%	3.30%
Percent of total financing receivables, 61 to 90 Days Past Due	2.20%	2.40%
Percent of total financing receivables, Over 90 Days Past Due	9.60%	11.10%
Percent of total financing receivables	100.00%	100.00%
Lease Comm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	82	93
31 to 60 Days Past Due	2	5
61 to 90 Days Past Due	3	4
Over 90 Days Past Due	67	83
Financing receivables, Ending balance	154	185
Over 90 Days Accruing	67	83
Time Payment Corp [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	153,710	147,709
31 to 60 Days Past Due	5,091	5,927
61 to 90 Days Past Due	3,875	4,158
Over 90 Days Past Due	17,292	19,669
Financing receivables, Ending balance	179,968	177,463
Over 90 Days Accruing	17,292	19,669
Time Payment Corp [Member] | Gold [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	65,989	58,769
31 to 60 Days Past Due	2,116	2,501
61 to 90 Days Past Due	814	902
Over 90 Days Past Due	2,018	3,391
Financing receivables, Ending balance	70,937	65,563
Over 90 Days Accruing	2,018	3,391
Time Payment Corp [Member] | Silver [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	78,947	81,152
31 to 60 Days Past Due	2,337	2,933
61 to 90 Days Past Due	2,535	2,754
Over 90 Days Past Due	12,309	13,437
Financing receivables, Ending balance	96,128	100,276
Over 90 Days Accruing	12,309	13,437
Time Payment Corp [Member] | Bronze [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	8,774	7,788
31 to 60 Days Past Due	638	493
61 to 90 Days Past Due	526	502
Over 90 Days Past Due	2,965	2,841
Financing receivables, Ending balance	12,903	11,624
Over 90 Days Accruing	$ 2,965	$ 2,841