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Net Periodic Cost for U.K Plan and Japan Plan (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
UNITED KINGDOM
      
Components of the net periodic pension cost:      
Interest cost $ 1,403 $ 1,359 $ 1,486
Expected return on plan assets (1,595) (1,270) (1,576)
Amortization of actuarial losses 668 392 224
Net periodic pension cost 476 481 134
JAPAN
      
Components of the net periodic pension cost:      
Service cost 147 121 106
Interest cost 22 15 18
Expected return on plan assets (8)    
Amortization of the unrecognized transition obligation 33 37 40
Amortization of prior service cost 20 3 2
Other 38    
Net periodic pension cost $ 252 $ 176 $ 166