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Effect of Derivative Financial Instruments on Consolidated Statements of Income and Comprehensive Income (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
Derivative [Line Items]        
Amount of loss recognized in OCI on derivative (effective portion) $ 27 $ 471 $ 34 $ 1,271
Derivatives in Cash Flow Hedging Relationships | Interest Expense [Member] | Interest Rate Swap [Member]
       
Derivative [Line Items]        
Amount of loss reclassified from accumulated OCI into income (effective portion) $ 457 $ 437 $ 906 $ 859