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Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Tax credits and loss carryforwards $ 1,710 $ 260
Accrued liabilities 6,629 9,852
Incentive compensation 13,867 21,206
Other 2,852 4,084
Deferred Tax Assets, Gross 25,058 35,402
Deferred tax liabilities    
Property, plant and equipment (12,813) (5,823)
Intangibles (45,960) (5,299)
Other (2,003) (3,264)
Deferred tax liability (60,776) (14,386)
Net deferred tax asset before valuation allowances and reserves (35,718) 21,016
Valuation allowances (1,237) (1,172)
Net deferred tax asset $ (36,955) $ 19,844