Summary of Significant Accounting Policies (Details Textual) (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
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Impairment of goodwill	$ 17,400,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 17,400,000	$ 0	$ 0
Excess amount deposited in excess of limit	105,000,000								105,000,000
Limit provided by banks and financial institutions for deposition	250,000								250,000
Credit terms available to debtors, minimum									30 days
Credit terms available to debtors, maximum									12 months
Maximum maturities period of cash and cash equivalents									90 days
Self insurance reserve	1,336,000				934,000				1,336,000	934,000
Advertising cost									6,499,000	6,254,000	7,122,000
Stock Options [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Options excluded from the computation of diluted net income per share									966,000	335,000	514,000
Maximum [Member]
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Minimum amortization period of intangible assets									9 years
Minimum [Member]
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Minimum amortization period of intangible assets									6 months
Computer Equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Useful life, minimum									5 years
Useful life, maximum									5 years
Computer Equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Useful life, minimum									3 years
Useful life, maximum									3 years
Furniture and Fixtures [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Furniture's and fixtures useful life lesser of lease term									lesser of lease term or estimated useful life of asset
Furniture and Fixtures [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Useful life, minimum									7 years
Useful life, maximum									7 years
Furniture and Fixtures [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Useful life, minimum									5 years
Useful life, maximum									5 years
Software and Software Development Costs [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of the assets									7
Equipment and improvement [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of the assets									3
Accounting Estimate For Commissions [Member]
Property, Plant and Equipment [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	(2,600,000)
Accounting Adjustment for Capitalized R&D Expense [Member] [Member]
Property, Plant and Equipment [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	1,700,000
Prior to 2013 [Member] | Accounting Estimate For Commissions [Member]
Property, Plant and Equipment [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ (2,100,000)