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Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning Balance $ (2,273) $ (2,312)  
Other comprehensive income (loss) before reclassifications 803 (295)  
Amounts reclassified from accumulated other comprehensive income (loss) 209 334  
Other comprehensive income (loss) 1,012 39 (456)
Accumulated other comprehensive income (loss), Ending Balance (1,261) (2,273) (2,312)
Defined Benefit Pension Items [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning Balance (2,188) (2,326)  
Other comprehensive income (loss) before reclassifications 674 (175)  
Amounts reclassified from accumulated other comprehensive income (loss) 239 313  
Other comprehensive income (loss) 913 138  
Accumulated other comprehensive income (loss), Ending Balance (1,275) (2,188)  
Gains (Losses) on Cash Flow Hedges [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning Balance (85) 14  
Other comprehensive income (loss) before reclassifications 171 (120)  
Amounts reclassified from accumulated other comprehensive income (loss) (72) 21  
Other comprehensive income (loss) 99 (99)  
Accumulated other comprehensive income (loss), Ending Balance $ 14 $ (85)