Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 98	$ 89	$ 1,268
Interest cost	122	163	290
Expected return on plan assets	(7)	(7)	(65)
Amortization of prior service cost	19	19	126
Amortization of net transition obligation	(1)	(1)	(1)
Amortization of plan loss	219	20	49
Recognized actuarial net loss	8	1	1
Acquisition	0	0	16
Curtailments	0	0	(726)
Net periodic pension benefit cost	$ 458	$ 284	$ 958