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Components of Accumulated Other Comprehensive Loss, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Accumulated translation adjustment:          
Balance at beginning of period $ (3,194) $ (5,674) $ (2,804) $ (5,881)  
Translation gain (loss) during period 200 1,246 (190) 1,453  
Balance at end of period (2,994) (4,428) (2,994) (4,428)  
Accumulated deferred losses on cash flow hedges:          
Balance at beginning of period (28)   (272)    
Derivative fair value adjustment, net of taxes of $32 and $172 for the three months ended September 30, 2013 and 2012, respectively, and $131 and $172 for the nine months ended September 30, 2013 and 2012, respectively (48) (258) 196 (258)  
Balance at end of period (76) (258) (76) (258)  
Accumulated effect of retirement benefit obligations:          
Balance at beginning of period (1,134) (688) (1,160)    
Net loss arising from retirement benefit obligations, net of taxes of $474 for the nine months ended September 30, 2012       (711)  
Amounts reclassified from accumulated other comprehensive loss:          
Amortization of actuarial losses, net of taxes of $8 and $27 for the three and nine months ended September 30, 2013, respectively 14 11 40 34  
Balance at end of period (1,120) (677) (1,120) (677)  
Total accumulated other comprehensive loss at end of period $ (4,190) $ (5,363) $ (4,190) $ (5,363) $ (4,236)