Other Income (Loss), net - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended	12 Months Ended
	Dec. 26, 2014	Oct. 28, 2013	Oct. 18, 2013	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Other Nonoperating Income Expense [Line Items]
Gain (loss) on sales/distributions of ownership interests					$ 1,523	$ 5,158	$ (4,032)
Anthem
Schedule of Other Nonoperating Income Expense [Line Items]
Proceeds from sales / distributions of ownership interests					1,000
Acquirgy
Schedule of Other Nonoperating Income Expense [Line Items]
Loan repayment from equity / cost method investment					$ 400
Symbio
Schedule of Other Nonoperating Income Expense [Line Items]
Equity method investment, consideration as cash	$ 8,100
Equity method investment, deferred gain on sale	800
Gain (loss) on sales/distributions of ownership interests	$ 4,300
WhiteFence | Allconnect
Schedule of Other Nonoperating Income Expense [Line Items]
Equity method investment, consideration as cash		$ 5,400
Equity method investment, deferred gain on sale		1,600
Gain (loss) on sales/distributions of ownership interests		$ (4,300)
WhiteFence | Other income (loss), net
Schedule of Other Nonoperating Income Expense [Line Items]
Gain on disposition of business				$ 500
StarCite
Schedule of Other Nonoperating Income Expense [Line Items]
Proceeds from sales / distributions of ownership interests						$ 300
Freeborders
Schedule of Other Nonoperating Income Expense [Line Items]
Gain (loss) on sales/distributions of ownership interests			$ 300