Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	$ 9,735	$ 9,048
Accrued employee benefits	5,532	5,260
Stock compensation	1,004	1,068
Accrued self-insurance	2,762	2,517
Acquisition costs	1,781	1,651
Net operating loss carry forward	1,880	983
Intangible asset impairment	38	43
Uncertain tax position-state tax portion	63	215
Uncertain tax position-interest expense	90	254
Other	155	93
Capital loss carryforward	154
Valuation allowance	(44)	(44)
Deferred tax assets	23,150	21,088
Deferred tax liabilities:
Amortization of intangible assets	(45,622)	(35,355)
Tax depreciation in excess of book depreciation	(8,397)	(8,201)
Prepaid expenses	(817)	(655)
Non-accrual experience accounting method	(255)	(606)
Deferred tax liabilities	(55,091)	(44,817)
Net deferred tax liability	$ (31,941)	$ (23,729)