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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
 12 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
2003 Interest Rate Protection Agreement
Dec. 31, 2003
2003 Interest Rate Protection Agreement
Dec. 31, 2008
2008 Interest Rate Protection Agreement
Dec. 31, 2011
2010 Interest Rate Protection Agreement
Jun. 30, 2012
2011 Interest Rate Protection Agreement
Dec. 31, 2012
2011 Interest Rate Protection Agreement
Dec. 31, 2014
Scenario, Forecast
Derivative [Line Items]                    
U.S. Treasury Note, maturity term (in years) 10                  
Proceeds from or (payments to) settlement of interest rate protection agreement $ 0 $ 65,500,000 $ (9,910,000)   $ 22,800,000 $ (4,400,000) $ 9,900,000   $ (65,500,000)  
Ineffective portion of derivative instruments               3,400,000    
Settlement gains from interest rate protection agreement       2,200,000            
Foreign currency forward contracts settled for a loss, amount     700,000              
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax                   (5,700,000)
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax                   $ (3,500,000)