Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current deferred tax assets
Compensation and benefits	$ 1,280,000	$ 372,000
Allowance for doubtful accounts	768,000	489,000
Accrued liabilities	713,000
Deferred revenue	205,000	171,000
Other	366,000	338,000
Total current deferred tax assets	3,332,000	1,370,000
Long-term deferred tax assets
Goodwill, other intangibles and other assets	95,275,000	59,124,000
Rent liabilities	1,839,000	1,337,000
Imputed interest deduction pursuant to tax receivable agreements	8,380,000	6,356,000
Other	885,000	636,000
Total long-term deferred tax assets	106,379,000	67,453,000
Long-term deferred tax liabilities
Property and equipment and other long-lived assets	(466,000)	(367,000)
Investments in equity method investees		(373,000)
Total long-term deferred tax liabilities	(466,000)	(740,000)
Net long-term deferred tax assets	105,913,000	66,713,000
Total deferred tax assets and liabilities	109,245,000	68,083,000
Deferred Tax Assets, Net, Noncurrent	106,033,000	$ 66,903,000
Secondary Offering
Long-term deferred tax liabilities
Deferred Tax Assets, Net, Noncurrent	$ 43,774,000