Summary of Significant Accounting Policies - Additional Information (Detail)		12 Months Ended
	Jun. 30, 2012 USD ($)	Dec. 31, 2015 USD ($) Segment Customer Unit shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Maturity period of cash and cash equivalent		Three months or less
Cash equivalent balances consisted in money market funds		$ 0	$ 4,100,000
Capitalized amount in product development cost		0	40,000
Amortization from capitalized software development costs		$ 191,000	214,000	$ 327,000
Number of reportable segments for business activities | Segment		1
Number of reporting units for goodwill allocation | Unit		3
Standard payment terms to customers		30 days
Losses recognized on fixed-price contracts		$ 0	0	0
Maintenance fee revenue recognition period		1 year
Purchase of software and intellectual property		$ 10,859,000	8,118,000	11,587,000
License related revenue				2,500,000	$ 788,000
Software modules contract expected revenue recognized after expiration				0
Consent solicitation expense		$ 495,000	$ 0	$ 0
Diluted computation increased | shares		63,000	47,000	507,000
Share-based awards outstanding under equity plans | shares		3,749,783	3,735,233	4,009,028
Excess customer balance from receivables		$ 0	$ 0
Customer balances excess percentage of total receivables balance		10.00%	10.00%
Customer threshold percentage of total receivables or total service revenue		10.00%	10.00%	10.00%
Number of largest customers | Customer		5
Reclassification of current deferred tax assets to noncurrent deferred tax assets		$ 24,032,000	$ 27,170,000
Revenue from Rights Concentration Risk [Member] | Sales Revenue, Net [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate service revenue		11.80%	17.80%	16.50%
Edgewater Fullscope [Member]
Summary Of Significant Accounting Policies [Line Items]
License related revenue				$ 2,500,000
Recent Accounting Pronouncement [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification of current deferred tax assets to noncurrent deferred tax assets		$ 2,000,000	$ 1,200,000
Option Plans [Member]
Summary Of Significant Accounting Policies [Line Items]
Diluted computation increased | shares		1,900,000
PI2 Solution [Member]
Summary Of Significant Accounting Policies [Line Items]
Purchase of software and intellectual property	$ 3,250,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives		3 years
Acquired intangible assets useful lives		1 year 6 months
Warranty period on fixed-price contracts		30 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives		10 years
Estimated economic life of product		3 years
Acquired intangible assets useful lives		6 years
Warranty period on fixed-price contracts		60 days