Accrued Liabilities - Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued salaries and benefits	$ 2,188	$ 2,328
Accrued judgments and settlements	3,300	3,350
Accrued warranty expense	1,087	955	496	484
Accrued income and other taxes	140	233
Other accrued expenses	2,692	1,974
Accrued liabilities	$ 9,407	$ 8,840