Fair Value of Plan Assets (Detail) (W.E.T, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
W.E.T
Change in plan assets:
Plan assets at beginning of year	$ 1,548	$ 1,098
Actual return on plan assets	59	41
Net contributions	664	386
Actuarial loss	(24)	(11)
Exchange rate impact	93	34
Plan assets at end of year	$ 2,340	$ 1,548