CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Instant Information Inc USD ($)	Thoughtcorp Inc USD ($)	Netsoft USD ($)	Jointech USD ($)	GGA USD ($)	Great Fridays USD ($)	Preferred Stock Series A-1 and A-2, Convertible Redeemable Preferred Stock USD ($)	Preferred Stock Series A-3 Convertible Preferred Stock USD ($)	Common Stock USD ($)	Common Stock Instant Information Inc	Common Stock Thoughtcorp Inc	Common Stock Empathy Lab, LLC	Common Stock Netsoft	Common Stock Jointech	Common Stock GGA	Common Stock Great Fridays	Additional Paid-in Capital USD ($)	Additional Paid-in Capital Instant Information Inc USD ($)	Additional Paid-in Capital Thoughtcorp Inc USD ($)	Additional Paid-in Capital Empathy Lab, LLC USD ($)	Additional Paid-in Capital Netsoft USD ($)	Additional Paid-in Capital Jointech USD ($)	Additional Paid-in Capital GGA USD ($)	Additional Paid-in Capital Great Fridays USD ($)	Retained Earnings USD ($)	Treasury Stock USD ($)	Treasury Stock Thoughtcorp Inc USD ($)	Treasury Stock Empathy Lab, LLC USD ($)	Treasury Stock Netsoft USD ($)	Treasury Stock Jointech USD ($)	Treasury Stock GGA USD ($)	Treasury Stock Great Fridays USD ($)	Accumulated Other Comprehensive Income USD ($)
Balance, beginning of period at Dec. 31, 2011	$ 95,059							$ 85,940	$ 0	$ 17								$ 40,020								$ 74,508	$ (15,972)							$ (3,514)
Balance, beginning of period (in shares) at Dec. 31, 2011								2,439,739	290,277	17,158,904
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued (in shares)										2,900,000
Stock issued	32,364									3								32,361
Conversion to common stock (in shares)								(2,439,739)	(290,277)	(21,840,128)
Conversion to common stock	85,940							(85,940)	0	22								85,918
Offering issuance costs	(3,395)																	(3,395)
Issuance of restricted stock (in shares)										213,656
Stock issued in connection with acquisition (in shares)											53,336	434,546	326,344
Stock issued in connection with acquisition		640	3,607																640	(346)	(2,969)							3,953	2,969
Stock-based compensation expense	6,826																	6,826
Proceeds from stock options exercises (in shares)	1,552,742									1,515,580
Proceeds from stock options exercises	4,965									2								4,963
Treasury stock retirement																		(353)									353
Excess tax benefits	3,297																	3,297
Currency translation adjustment	2,493																																	2,493
Net income	54,484																									54,484
Balance, end of period at Dec. 31, 2012	286,280							0	0	44								166,962								128,992	(8,697)							(1,021)
Balance, end of period (in shares) at Dec. 31, 2012								0	0	44,442,494
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued (in shares)										14,041
Stock issued in connection with acquisition (in shares)													1,483
Stock issued in connection with acquisition																					(13)								13
Stock-based compensation expense	13,150																	13,150
Proceeds from stock options exercises (in shares)	2,156,898									2,156,898
Proceeds from stock options exercises	9,287									2								9,285
Excess tax benefits	6,201																	6,201
Currency translation adjustment	(811)																																	(811)
Net income	61,994																									61,994
Balance, end of period at Dec. 31, 2013	376,101							0	0	46								195,585								190,986	(8,684)							(1,832)
Balance, end of period (in shares) at Dec. 31, 2013								0	0	46,614,916
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued (in shares)										7,738
Awards forfeited/cancelled										(24,474)
Forfeiture of stock issued in connection with acquisition																		223									(223)
Stock issued in connection with acquisition (in shares)														2,289	179,104	262,277	90,864
Stock issued in connection with acquisition					2,788																	(21)	1,158	(2,386)	(827)					21	1,630	2,386	827
Stock-based compensation expense	21,397																	21,397
Proceeds from stock options exercises (in shares)	1,171,097									1,171,097
Proceeds from stock options exercises	10,598									2								10,596
Excess tax benefits	3,776																	3,776
Prior periods retained earning adjustment																										(29)								29
Currency translation adjustment	(20,251)																																	(20,251)
Net income	69,641			806	(3,090)	822	(72)																			69,641
Balance, end of period at Dec. 31, 2014	$ 464,050							$ 0	$ 0	$ 48								$ 229,501								$ 260,598	$ (4,043)							$ (22,054)
Balance, end of period (in shares) at Dec. 31, 2014								0	0	48,303,811