Consolidated Businesses - Allocations of Purchase Price to Identified Intangible Assets and Tangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2016	Sep. 16, 2016	Jan. 22, 2016	Nov. 25, 2015
Net assets acquired:
Goodwill	$ 231,787	$ 220,459
Technology | Minimum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years	5 years
Technology | Maximum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	10 years	10 years
Non-compete agreements | Minimum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	2 years	2 years
Non-compete agreements | Maximum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years	5 years
ErgoAdvocate, WellNet, and E3 Solutions | Customer lists | Minimum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
ErgoAdvocate, WellNet, and E3 Solutions | Customer lists | Maximum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	11 years
ErgoAdvocate, WellNet, and E3 Solutions | Trademarks, tradenames, and domain names | Minimum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
ErgoAdvocate, WellNet, and E3 Solutions | Trademarks, tradenames, and domain names | Maximum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	11 years
ErgoAdvocate, WellNet, and E3 Solutions | Technology | Minimum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	7 years
ErgoAdvocate, WellNet, and E3 Solutions | Technology | Maximum
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	9 years
ErgoAdvocate, WellNet, and E3 Solutions | Non-compete agreements
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
ErgoAdvocate
Net assets acquired:
Goodwill					$ 155
Other net assets (liabilities)					0
Total net assets acquired					1,250
ErgoAdvocate | Customer lists
Net assets acquired:
Intangible assets					26
ErgoAdvocate | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets					0
ErgoAdvocate | Technology
Net assets acquired:
Intangible assets					1,069
ErgoAdvocate | Non-compete agreements
Net assets acquired:
Intangible assets					0
Deferred revenue					$ 0
WellNet
Net assets acquired:
Goodwill						$ 0
Other net assets (liabilities)						0
Total net assets acquired						2,897
WellNet | Customer lists
Net assets acquired:
Intangible assets						2,897
WellNet | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets						0
WellNet | Technology
Net assets acquired:
Intangible assets						0
WellNet | Non-compete agreements
Net assets acquired:
Intangible assets						0
Deferred revenue						$ 0
E3 Solutions
Net assets acquired:
Goodwill				$ 1,074
Other net assets (liabilities)				0
Total net assets acquired				3,000
E3 Solutions | Customer lists
Net assets acquired:
Intangible assets				28
E3 Solutions | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets				6
E3 Solutions | Technology
Net assets acquired:
Intangible assets				1,822
E3 Solutions | Non-compete agreements
Net assets acquired:
Intangible assets				70
Deferred revenue				$ 0
SAS
Net assets acquired:
Goodwill			$ 10,099
Other net assets (liabilities)			(397)
Total net assets acquired			12,249
SAS | Customer lists
Net assets acquired:
Intangible assets			2,271
SAS | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets			0
SAS | Technology
Net assets acquired:
Intangible assets			356
SAS | Non-compete agreements
Net assets acquired:
Intangible assets			240
Deferred revenue			$ (320)