Consolidated Businesses - Allocations of Purchase Price to Identified Intangible Assets and Tangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Net assets acquired:
Goodwill	$ 222,694	$ 220,459
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, trade names, and domain names
Net assets acquired:
Intangible assets	0
ErgoAdvocate | Technology
Net assets acquired:
Intangible assets	1,069
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, trade names, and domain names
Net assets acquired:
Intangible assets	0
WellNet | Technology
Net assets acquired:
Intangible assets	0
E3 Solutions
Net assets acquired:
Goodwill	2,080
Other net assets (liabilities)	0
Total net assets acquired	3,000
E3 Solutions | Customer lists
Net assets acquired:
Intangible assets	0
E3 Solutions | Trademarks, trade names, and domain names
Net assets acquired:
Intangible assets	0
E3 Solutions | Technology
Net assets acquired:
Intangible assets	$ 920
ErgoAdvocate, WellNet, and E3 Solutions | Trademarks, trade names, and domain names
Business Acquisition [Line Items]
Finite intangible assets, useful life	8 years
Minimum | Trademarks, trade names, and domain names
Business Acquisition [Line Items]
Finite intangible assets, useful life	3 years	3 years
Minimum | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life	5 years	5 years
Minimum | ErgoAdvocate, WellNet, and E3 Solutions | Customer lists
Business Acquisition [Line Items]
Finite intangible assets, useful life	5 years
Minimum | ErgoAdvocate, WellNet, and E3 Solutions | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life	5 years
Maximum | Trademarks, trade names, and domain names
Business Acquisition [Line Items]
Finite intangible assets, useful life	11 years	11 years
Maximum | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life	10 years	10 years
Maximum | ErgoAdvocate, WellNet, and E3 Solutions | Customer lists
Business Acquisition [Line Items]
Finite intangible assets, useful life	8 years
Maximum | ErgoAdvocate, WellNet, and E3 Solutions | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life	9 years