Fair Value Measurements - Additional Information (Detail) - USD ($)	2 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 231,787,000	$ 231,787,000	$ 220,459,000
Goodwill impairment loss		$ 0
Book value of assets per share (in dollars per share)	$ 10.46	$ 10.46	$ 8.78
Common stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share price of common stock (in dollars per share)	$ 14.00	$ 14.00	$ 11.45
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 8,752,000	$ 8,752,000	$ 1,968,000
Fair value, inputs, Level 3 | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	8,752,000	8,752,000	1,968,000
KMI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability paid at its maximum value		2,000,000.0
Payments of contingent consideration reflected as an outflow from financing activities		1,200,000
Contingent consideration reflected as an outflow from operating activities		800,000
KMI | Fair value, inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability			1,200,000
SAS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	8,800,000	8,800,000		$ 8,400,000
Remeasurement charge	400,000
Goodwill				$ 10,099,000
SAS | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 20,400,000	$ 20,400,000
FolioDynamix
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			166,200,000
Goodwill impairment loss			39,700,000
FolioDynamix | Fair value, inputs, Level 3 | Fair value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill (annual impairment assessment)			$ 126,500,000
FolioDynamix | Fair value, inputs, Level 3 | Fair value, measurements, nonrecurring | Goodwill
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate			23.40%