Condensed Consolidating Financial Statements - Consolidating Statements of Cash Flows - (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Cash Flow Statements Captions [Line Items]
Cash Flows from Operating Activities	$ 98,592	$ 87,865
Cash Flows from Investing Activities
Loans and finance receivables originated or acquired	(276,847)	(226,701)
Loans and finance receivables repaid	211,177	221,901
Change in restricted cash	(13,717)
Purchases of property and equipment	(2,230)	(11,572)
Other investing activities	58
Net cash used in investing activities	(81,559)	(16,372)
Cash Flows from Financing Activities
Debt issuance costs paid	(3,271)
Treasury shares purchased	(58)
Borrowings under revolving line of credit	10,000
Repayments under revolving line of credit	(68,400)
Borrowings under securitization facility	135,061
Repayments under securitization facility	(21,148)
Net cash provided by financing activities	52,184
Effect of exchange rates on cash	928	(3,155)
Net increase in cash and cash equivalents	70,145	68,338
Cash and cash equivalents at beginning of year	42,066	75,106
Cash and cash equivalents at end of period	112,211	$ 143,444
Parent
Condensed Cash Flow Statements Captions [Line Items]
Cash Flows from Operating Activities	75,286
Cash Flows from Investing Activities
Capital contributions to subsidiaries	(16,828)
Net cash used in investing activities	(16,828)
Cash Flows from Financing Activities
Treasury shares purchased	(58)
Borrowings under revolving line of credit	10,000
Repayments under revolving line of credit	(68,400)
Net cash provided by financing activities	(58,458)
Guarantor Subsidiaries
Condensed Cash Flow Statements Captions [Line Items]
Cash Flows from Operating Activities	(3,466)
Cash Flows from Investing Activities
Loans and finance receivables originated or acquired	(138,592)
Loans and finance receivables repaid	212,682
Purchases of property and equipment	(2,140)
Capital contributions to subsidiaries	(3,250)
Other investing activities	58
Net cash used in investing activities	68,758
Cash Flows from Financing Activities
Payments for (proceeds from) member's equity	3,658
Net cash provided by financing activities	3,658
Effect of exchange rates on cash	844
Net increase in cash and cash equivalents	69,794
Cash and cash equivalents at beginning of year	40,927
Cash and cash equivalents at end of period	110,721
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements Captions [Line Items]
Cash Flows from Operating Activities	39,942
Cash Flows from Investing Activities
Loans and finance receivables originated or acquired	(138,255)
Loans and finance receivables repaid	(1,505)
Change in restricted cash	(13,717)
Purchases of property and equipment	(90)
Net cash used in investing activities	(153,567)
Cash Flows from Financing Activities
Payments for (proceeds from) member's equity	3,250
Debt issuance costs paid	(3,271)
Borrowings under securitization facility	135,061
Repayments under securitization facility	(21,148)
Net cash provided by financing activities	113,892
Effect of exchange rates on cash	84
Net increase in cash and cash equivalents	351
Cash and cash equivalents at beginning of year	1,139
Cash and cash equivalents at end of period	1,490
Eliminations
Condensed Cash Flow Statements Captions [Line Items]
Cash Flows from Operating Activities	(13,170)
Cash Flows from Investing Activities
Capital contributions to subsidiaries	20,078
Net cash used in investing activities	20,078
Cash Flows from Financing Activities
Payments for (proceeds from) member's equity	(6,908)
Net cash provided by financing activities	$ (6,908)