Acquisitions - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) Entity Investment	Dec. 31, 2015 USD ($) Business Entity Investment	Dec. 31, 2014 USD ($)	Apr. 29, 2016
Business Acquisition [Line Items]
Business consideration, net of cash acquired									$ 269,222	$ 56,647	$ 58,902
Amortization expense									68,500	41,900	38,900
Amortization expense, 2017	$ 32,979								32,979
Amortization expense, 2018	32,056								32,056
Amortization expense, 2019	24,351								24,351
Amortization expense, 2020	19,622								19,622
Amortization expense, 2021	16,287								16,287
Amortization expense, thereafter	58,889								58,889
Deferred tax liability	9,708				$ 11,378				9,708	11,378
Goodwill	565,036		$ 237,234		458,409				565,036	458,409
Revenue	254,149	$ 229,844	242,603	$ 223,198	242,935	$ 231,936	$ 231,964	$ 221,599	949,794	928,434	908,974
Net loss	54,455	$ (7,508)	$ (7,746)	$ (4,543)	(18,257)	$ (31,969)	$ (23,212)	$ (19,090)	34,658	(92,528)	(51,172)
Pro forma revenue reduced									(964,332)	(963,023)
Pro forma net income									28,325	(83,895)
Goodwill amount related to acquisition									237,233	40,130
Other investments in private entity									$ 7,150	$ 5,298	$ 8,567
Number of private entity investments | Entity									4	6
Number of investment | Investment									10	9
Carrying value of company's investment	28,700				23,300				$ 28,700	$ 23,300
Available-for-Sale Securities [Member]
Business Acquisition [Line Items]
Number of private entity investments | Entity									4	2
Other investments available-for-sale securities in private entity	2,700				600				$ 2,700	$ 600
Fair value of available-for-sale securities	4,900				3,500				$ 4,900	$ 3,500
Equity Method [Member]
Business Acquisition [Line Items]
Number of private entity investments | Entity									1	1
Carrying value of company's investment	5,400				6,100				$ 5,400	$ 6,100
Private Entity Investments [Member]
Business Acquisition [Line Items]
Other investments in private entity									4,500	4,800
Deferred Revenue Fair Value Adjustment [Member]
Business Acquisition [Line Items]
Pro forma revenue reduced										11,600
Pro forma net income										6,900
Debt Modification Costs [Member]
Business Acquisition [Line Items]
Pro forma net income										1,000
CXO Acquisition Co and Sports Leadership Acquisition Co
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired												100.00%
Business consideration, net of cash acquired									269,200
Business acquisitions, cash paid									17,600
Intangible assets acquired	51,200								$ 51,200
Amortization period									6 years 4 months 24 days
Amortization expense									$ 5,500
Amortization expense, 2017	7,800								7,800
Amortization expense, 2018	7,800								7,800
Amortization expense, 2019	7,400								7,400
Amortization expense, 2020	7,200								7,200
Amortization expense, 2021	6,300								6,300
Amortization expense, thereafter	7,700								7,700
Tax deductible intangible assets	25,000								25,000
Deferred tax liability	10,900								10,900
Goodwill	237,200								237,200
Expected tax deductible goodwill	47,600								47,600
Revenue									32,000
Net loss									67,500
CXO Acquisition Co and Sports Leadership Acquisition Co | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired	27,700								$ 27,700
Amortization period									7 years
CXO Acquisition Co and Sports Leadership Acquisition Co | Software [Member]
Business Acquisition [Line Items]
Intangible assets acquired	16,400								$ 16,400
Amortization period									6 years 1 month 6 days
CXO Acquisition Co and Sports Leadership Acquisition Co | Intellectual Property [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 7,100								$ 7,100
Amortization period									5 years
Other Acquisitions
Business Acquisition [Line Items]
Business consideration, net of cash acquired										56,647
Intangible assets acquired					$ 24,200					$ 24,200
Amortization period										4 years
Number of businesses acquired | Business										4
Goodwill amount related to acquisition										$ 40,130