Goodwill and Intangible Assets - Summary of Intangible Assets from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	$ 118,756	$ 111,409
Accumulated amortization	(46,050)	(31,666)
Net carrying amount, finite-lived intangible assets	72,706	79,743
Indefinite-lived Intangible Assets [Line Items]
Gross carrying amount, intangible assets	119,456	112,109
Net carrying amount, intangible assets, net	73,406	80,443
Other intellectual property
Indefinite-lived Intangible Assets [Line Items]
Gross carrying amount, indefinite-lived intangible assets (excluding goodwill)	700	700
Internet domain names
Indefinite-lived Intangible Assets [Line Items]
Gross carrying amount, indefinite-lived intangible assets (excluding goodwill)	300	300
Estimated salvage value of the asset	400	400
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	65,603	61,820
Accumulated amortization	(21,783)	(14,377)
Net carrying amount, finite-lived intangible assets	$ 43,820	$ 47,443
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	1 year	1 year
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	11 years	11 years
Trademarks/trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	$ 22,904	$ 22,898
Accumulated amortization	(10,043)	(6,829)
Net carrying amount, finite-lived intangible assets	$ 12,861	$ 16,069
Trademarks/trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	3 years	3 years
Trademarks/trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	11 years	11 years
Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	$ 26,334	$ 23,086
Accumulated amortization	(10,675)	(6,945)
Net carrying amount, finite-lived intangible assets	$ 15,659	$ 16,141
Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	5 years	5 years
Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	10 years	10 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	$ 3,915	$ 3,605
Accumulated amortization	(3,549)	(3,515)
Net carrying amount, finite-lived intangible assets	$ 366	$ 90
Non-compete agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	2 years	2 years
Non-compete agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite intangible assets, useful life (in years)	5 years	5 years