Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	$ 9,048	$ 6,397
Accrued employee benefits	5,260	4,195
Stock compensation	1,068	1,228
Accrued self-insurance	2,517	2,526
Acquisition costs	1,651	1,510
Net operating loss carry forward	983	927
Intangible asset impairment	43	49
Uncertain tax position-state tax portion	215	215
Deferred Tax Assets, Interest Expense	254	186
Other	93	121
Valuation allowance	(44)	(44)
Deferred tax assets	21,088	17,310
Deferred tax liabilities:
Amortization of intangible assets	(35,355)	(29,370)
Tax depreciation in excess of book depreciation	(8,201)	(7,994)
Prepaid expenses	(655)	(697)
Non-accrual experience accounting method	(606)	(1,459)
Deferred tax liabilities	(44,817)	(39,520)
Net deferred tax liability	$ (23,729)	$ (22,210)