Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating losses and tax credit carryforwards – federal and state	$ 27,294	$ 29,409
Bad debt allowance	898	827
Accrued compensation and severance	15,229	14,179
Pension reserves	595	1,494
Insurance reserves	13,994	13,483
Leases	5,374	5,332
Accrued expenses	4,231	3,114
Interest carryforwards	32,272	5,074
Other assets	2,284	1,747
Total gross deferred tax assets	102,171	74,659
Less: valuation allowance	(24,079)	(21,155)
Deferred tax assets	78,092	53,504
Deferred tax liabilities:
Fixed asset basis difference	(48,698)	(54,214)
Prepaid items	(1,728)	(1,490)
Intangible assets	(87,628)	(70,820)
Other liabilities	(16,942)	(3,582)
Total deferred tax liabilities	(154,996)	(130,106)
Total net deferred tax liability	$ (76,904)	$ (76,602)