Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Intangible assets	$ 22,880	$ 24,170
Other	12	37
Total deferred tax assets	22,892	24,207
Deferred tax liabilities
Intangible assets	241	202
Investment on underlying SLP partnership	1,382	1,170
Total deferred tax liabilities	1,623	1,372
Net deferred tax assets (liabilities)	$ 21,269	$ 22,835