Accrued Liabilities - Summary of Accrued Warranty Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Balance at January 1,	$ 2,762	$ 2,631
Warranty liabilities assumed from acquisitions	300	993
Amortization of fair value adjustment of warranty liabilities acquired through acquisitions	(47)	(200)
Warranty expense	394	64
Warranty charges	(1,210)	(726)
Balance at September 30,	$ 2,199	$ 2,762