Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax Contingency [Line Items]
Income tax expense	$ 22,440,000	$ 12,369,000	$ 13,871,000	$ 13,521,000	$ 22,891,000	$ 10,683,000	$ 13,367,000	$ 12,238,000	$ 62,201,083	$ 59,178,898	$ 51,999,932
U.S. federal income tax rate (in hundredths)									35.00%
Valuation allowance for deferred tax assets	1,274				1,274				1,274	1,274
Total gross unrecognized tax benefits including interest	3,200,000				2,900,000				3,200,000	2,900,000
Unrecognized tax benefits that are permanent in nature and, if recognized, would affect the annual effective tax rate	1,600,000				1,500,000				1,600,000	1,500,000
Gross unrecognized tax benefits expected to be resolved during the next 12 months through settlements with taxing authorities or the expiration of the statute of limitations	2,000,000								2,000,000
Accrued gross interest	417,004								417,004
Current period gross interest expense									240,609
Servicios World Acceptance Corporation de Mexico, S. de R.L. de C.V. [Member]
Income Tax Contingency [Line Items]
Cumulative undistributed net earnings permanently reinvested in Mexican foreign subsidiaries	$ 8,300,000								$ 8,300,000