Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Tax credits and loss carryforwards	$ 563	$ 2,550
Accrued liabilities	9,211	6,882
Incentive compensation	24,682	19,333
Other	3,909	3,389
Deferred Tax Assets, Gross	38,365	32,154
Deferred tax liabilities
Property, plant and equipment	(4,000)	(2,858)
Intangibles	(5,325)	(5,565)
Prepaid assets	(697)	(638)
Convertible note discount	(3,234)	(5,117)
Other	(1,658)	(2,025)
Deferred tax liability	(14,914)	(16,203)
Net deferred tax asset before valuation allowances and reserves	23,451	15,951
Valuation allowances	(1,159)	(1,307)
Net deferred tax asset	$ 22,292	$ 14,644