Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets
Losses & IRC Section 163(j) carryforwards	$ 16,218	$ 24,372
Compensation related deductions	2,725	4,737
Tax credits	3,817	5,101
Restructuring related liabilities	406	510
Inventory	5,680	6,493
Depreciation	938	194
Amortization	163
Warranty	1,007	680
Other	854	598
Total deferred tax assets	31,808	42,685
Valuation allowance for deferred tax assets	(11,534)	(15,481)
Net deferred income tax assets	20,274	27,204
Deferred tax liabilities
Equity investment	(1,025)	(807)
Depreciation	(471)
Amortization	(11,283)	(14,254)
Unrealized gain/loss	(985)	(1,132)
Other	(581)	(201)
Total deferred tax liabilities	(14,345)	(16,394)
Net deferred income tax assets (liabilities)	$ 5,929	$ 10,810