Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets
Losses & IRC Section 163(j) carryforwards	$ 24,372	$ 26,164
Compensation related deductions	4,737	3,507
Tax credits	5,101	6,395
Restructuring related liabilities	510	581
Inventory	6,493	6,613
Depreciation	194
Warranty	680	761
Unrealized gain/loss		727
Other	598	679
Total deferred tax assets	42,685	45,427
Valuation allowance for deferred tax assets	(15,481)	(28,507)
Net deferred income tax assets	27,204	16,920
Deferred tax liabilities
Equity investment	(807)	(699)
Depreciation		(2,633)
Amortization	(14,254)	(15,510)
Unrealized gain/loss	(1,132)
Other	(201)	(760)
Total deferred tax liabilities	(16,394)	(19,602)
Net deferred income tax asset (liability)	$ 10,810	$ (2,682)