Consolidated Businesses - Allocations of Purchase Price to Identified Intangible Assets and Tangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jul. 13, 2015	Jun. 10, 2015	Dec. 17, 2014	Oct. 01, 2014	Aug. 08, 2014
Net assets acquired:
Goodwill	$ 226,034	$ 265,084
Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
Non-compete agreements
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
KMI
Net assets acquired:
Goodwill							$ 6,735
Other net assets (liabilities)							1,165
Purchase price allocation assets acquired							11,500
KMI | Customer lists
Net assets acquired:
Intangible assets							2,900
KMI | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets							300
KMI | Technology
Net assets acquired:
Intangible assets							400
KMI | Non-compete agreements
Net assets acquired:
Intangible assets							$ 0
Ludwig
Net assets acquired:
Goodwill						$ 455
Other net assets (liabilities)						0
Purchase price allocation assets acquired						2,950
Ludwig | Customer lists
Net assets acquired:
Intangible assets						2,366
Ludwig | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets						0
Ludwig | Technology
Net assets acquired:
Intangible assets						0
Ludwig | Non-compete agreements
Net assets acquired:
Intangible assets						$ 129
NuCivic
Net assets acquired:
Goodwill					$ 1,257
Other net assets (liabilities)					197
Purchase price allocation assets acquired					2,000
NuCivic | Customer lists
Net assets acquired:
Intangible assets					202
NuCivic | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets					330
NuCivic | Technology
Net assets acquired:
Intangible assets					0
NuCivic | Non-compete agreements
Net assets acquired:
Intangible assets					$ 14
Talent Management in Government Inc.
Net assets acquired:
Goodwill				$ 0
Other net assets (liabilities)				0
Purchase price allocation assets acquired				500
Talent Management in Government Inc. | Customer lists
Net assets acquired:
Intangible assets				250
Talent Management in Government Inc. | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets				0
Talent Management in Government Inc. | Technology
Net assets acquired:
Intangible assets				250
Talent Management in Government Inc. | Non-compete agreements
Net assets acquired:
Intangible assets				$ 0
Textizen
Net assets acquired:
Goodwill			$ 606
Other net assets (liabilities)			(41)
Purchase price allocation assets acquired			1,200
Textizen | Customer lists
Net assets acquired:
Intangible assets			171
Textizen | Trademarks, tradenames, and domain names
Net assets acquired:
Intangible assets			117
Textizen | Technology
Net assets acquired:
Intangible assets			347
Textizen | Non-compete agreements
Net assets acquired:
Intangible assets			$ 0
Minimum | Customer lists
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
Minimum | Trademarks, tradenames, and domain names
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years
Minimum | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years	5 years
Minimum | Non-compete agreements
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	2 years	2 years
Maximum | Customer lists
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	11 years
Maximum | Trademarks, tradenames, and domain names
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	11 years
Maximum | Technology
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	10 years	10 years
Maximum | Non-compete agreements
Business Acquisition [Line Items]
Finite intangible assets, useful life (in years)	5 years	5 years