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
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 2,474	$ 1,937	$ 545
Charged to Other Accounts	(8)	4	5
Inventory write off	(2,382)	4	(73)
Balance at end of year	1,807	2,474	1,937
Valuation Allowance of Deferred Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	2,199	3,702	6,579
Charged to Other Accounts		(1,503)	(2,877)
Inventory write off
Balance at end of year	2,199	2,199	3,702
Inventory Valuation Reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	2,185	1,127	572
Charged to Other Accounts	(25)	(34)	33
Inventory write off	(6)	(215)	(10)
Balance at end of year	$ 2,933	$ 2,185	$ 1,127