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Change in Benefit Obligations (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]      
Benefit obligation at beginning of year $ 22,527 $ 19,924  
Service cost 251 242 212
Interest cost 1,005 964 931
Plan participants' contributions 75 101  
Benefits paid (105) (237)  
Actuarial loss 680 405  
Foreign currency exchange rate changes 525 1,128  
Benefit obligation at end of year $ 24,958 $ 22,527 $ 19,924