Derivative Instruments Amounts Recorded in AOCL and Gain or (Loss) Reclassified Out of AOCL (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Interest Expense
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Loss Reclassified from AOCL into Operations (Effective Portion) $ (331) $ (95) $ (654) $ (188)
General and Administrative Expense
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Loss Reclassified from AOCL into Operations (Effective Portion) 0 0 0 (22)
Amount of Gain or (Loss) Recognized in Operations on Derivative (Ineffective Portion) (3) 54 (3) 54
Cash Flow Hedging | Interest Rate Swap
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) or Gain Recognized in AOCL on Derivative (Effective Portion) $ (875) $ 502 $ (1,277) $ 470