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Components of Accumulated Other Comprehensive Loss, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Accumulated translation adjustment:          
Balance at beginning of period $ (1,679) $ (3,800) $ (2,804) $ (5,881)  
Translation gain (loss) during period (1,515) (1,874) (390) 207  
Balance at end of period (3,194) (5,674) (3,194) (5,674)  
Accumulated deferred losses on cash flow hedges:          
Balance at beginning of period (259)   (272)    
Derivative fair value adjustment, net of taxes of $154 and $163 for the three and six months ended June 30, 2013, respectively 231   244    
Balance at end of period (28)   (28)    
Accumulated effect of retirement benefit obligations:          
Balance at beginning of period (1,147)   (1,160)    
Net loss arising from retirement benefit obligations, net of taxes of $483 for the three and six months ended June 30, 2012   (702)   (702)  
Amounts reclassified from accumulated other comprehensive loss:          
Amortization of acturial losses, net of taxes of $9 for the three months ended June 30, 2013 and 2012 and $18 and $9 for the six months ended June 30, 2013 and 2012, respectively 13 14 26 14  
Balance at end of period (1,134) (688) (1,134) (688)  
Total accumulated other comprehensive loss at end of period $ (4,356) $ (6,362) $ (4,356) $ (6,362) $ (4,236)