Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Significant Accounting Policies [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
Term for post-contract technical support			1 year
Term of agreement for revenue recognition			2 years
Depreciation and amortization	4,351,000	4,405,000	8,472,000	6,691,000
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	34,396,000		34,396,000		32,703,000
Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Employee compensation and benefits expense		2,900,000
Depreciation and amortization		1,300,000
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization		$ 1,600,000		$ 1,600,000
Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives of amortizable intangibles			3 years
Minimum [Member] | Business Combinations [Member]
Significant Accounting Policies [Line Items]
Estimated life of intangible assets			3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives of amortizable intangibles			7 years
Maximum [Member] | Business Combinations [Member]
Significant Accounting Policies [Line Items]
Estimated life of intangible assets			15 years
Internally Developed Software [Member]
Significant Accounting Policies [Line Items]
Estimated life of intangible assets			3 years
Forward Contracts [Member]
Significant Accounting Policies [Line Items]
Number of foreign currency contracts	1		1