Reconciliation of Changes in Accrued Warranty Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Warranties [Line Items]
Balance at beginning of year	$ 8,487	$ 1,261
Assumed warranty from W.E.T. at acquisition		6,979
Warranty claims paid	(347)	(81)
Expense	215	551
Adjustment due to currency translation	233	(223)
Balance at end of year	$ 8,588	$ 8,487