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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating losses and tax credit carryforwards - federal and state $ 47,695 $ 5,082
Bad debt allowance 14,050 9,028
Accrued compensation and severance 20,150 11,517
Pension reserves 536 1,975
Insurance reserves 15,449 4,621
Leases 2,675 850
Accrued expenses 5,324 41
Other assets 3,551 1,989
Total gross deferred tax assets 109,430 35,103
Less: valuation allowance (16,571) (4,734)
Deferred tax assets 92,859 30,369
Deferred tax liabilities:    
Fixed asset basis difference (11,392) (38,147)
Prepaid items (3,113) (1,705)
Intangible assets (48,918) (21,094)
Other liabilities (4,258) (7)
Total deferred tax liabilities (67,681) (60,953)
Total net deferred tax asset $ 25,178  
Total net deferred tax liability   $ (30,584)