Fair Value Measurements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill	$ 222,694	$ 220,459
Book value of assets per share (in dollars per share)	$ 8.03
Common stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Share price of common stock (in dollars per share)	$ 12.95
KMI
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability paid at its maximum value	$ 2,000
Payments of contingent consideration reflected as an outflow from financing activities	1,200
Contingent consideration reflected as an outflow from operating activities	800
FolioDynamix
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill		166,200
Impairment loss		39,700
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability		1,200
Level 3 | KMI
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 1,200
Level 3 | Nonrecurring | FolioDynamix
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill (annual impairment assessment)		$ 126,500
Level 3 | Nonrecurring | FolioDynamix | Goodwill
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate		23.40%
GovDelivery | Disposed of by sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Decrease in cash and cash equivalents from discontinued operations		$ 100