Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 6	$ 8	$ 162
Charged to costs & expenses	136	38	117
Deductions	12	40	271
Balance at end of period	130	6	8
Inventory Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	11,957	9,419	8,932
Charged to costs & expenses	11,457	3,042	1,137
Deductions	421	504	650
Balance at end of period	22,993	11,957	9,419
Warranty Liability [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	9,653	4,118	3,304
Assumed on acquisition		3,781	33
Charged to costs & expenses	4,051	5,363	2,860
Deductions	4,727	3,609	2,079
Balance at end of period	8,977	9,653	4,118
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	10,939	7,585	5,627
Assumed on acquisition			1,462
Charged to costs & expenses	(1,056)	3,594	496
Deductions	1,041	240
Balance at end of period	$ 8,842	$ 10,939	$ 7,585