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Financial Instruments - Summary of Outstanding Interest Rate Swap (Parenthetical) (Detail) (Interest rate swap [Member], USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Notional value $ 40,000 $ 40,000
Interest rate swap, description of interest received Interest that varied with the three-month LIBOR  
Interest rate swap, fixed interest rate 1.41% 1.41%
June 2014 [Member]
    
Derivatives, Fair Value [Line Items]    
Notional value 15,000 15,000
Interest rate swap, expiration date 2014-06 2014-06
June 2015 [Member]
    
Derivatives, Fair Value [Line Items]    
Notional value $ 25,000 $ 25,000
Interest rate swap, expiration date 2015-06 2015-06