Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Restatement Adjustment [Member]	Sep. 30, 2013 Internally Developed Software [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]
Property, Plant and Equipment [Line Items]
Maximum maturity period for classification of investments as cash equivalents			3 months
Investments other-than-temporary losses			$ 0	$ 0
Contractual maturities accounts receivable			less than one year
Estimated useful lives of amortizable intangibles								3 years	7 years
Estimated life of intangible assets							3 years	3 years	15 years
Term for post-contract technical support			1 year
Contract loss provisions recorded	0	0	0	0
Term of agreement for revenue recognition			2 years
Employee compensation and benefit expense						2,900,000
Depreciation and amortization	3,460,000	1,715,000	10,151,000	4,786,000		1,300,000
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	$ 27,617,000		$ 27,617,000		$ 18,009,000	$ 1,600,000