Annual report pursuant to Section 13 and 15(d)

Interest Rate Swap Agreements - Additional Information (Detail)

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Interest Rate Swap Agreements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Agreement
Derivative [Line Items]      
Number of interest rate swap agreements     3
Amortized interest expenses related to a previously terminated interest rate swap agreement $ 2,470 $ 4,236  
Losses accumulated in other comprehensive income related to a previously terminated interest rate swap agreement     $ 18,147