Goodwill and Intangible Assets - Company's Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 117,272	$ 114,827
Accumulated Amortization	(66,376)	(54,207)
Net Intangibles	$ 50,896	$ 60,620
Weighted Average Amortization Period (years)	8 years	8 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 102,594	$ 100,719
Accumulated Amortization	(58,294)	(47,571)
Net Intangibles	$ 44,300	$ 53,148
Weighted Average Amortization Period (years)	8 years	8 years
Trade Name and Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 11,698	$ 11,600
Accumulated Amortization	(5,470)	(4,128)
Net Intangibles	$ 6,228	$ 7,472
Weighted Average Amortization Period (years)	8 years	8 years
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 1,190	$ 1,209
Accumulated Amortization	$ (1,190)	$ (1,209)
Weighted Average Amortization Period (years)	2 years	2 years
Proprietary Software [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 850	$ 850
Accumulated Amortization	$ (850)	$ (850)
Weighted Average Amortization Period (years)	2 years	2 years
Favorable Lease Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 449	$ 449
Accumulated Amortization	$ (449)	$ (449)
Weighted Average Amortization Period (years)	2 years	2 years
Content Library [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Intangibles	$ 491
Accumulated Amortization	(123)
Net Intangibles	$ 368
Weighted Average Amortization Period (years)	2 years