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Derivatives - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Interest Rate Swaps [Member]
Jun. 09, 2011
Interest Rate Swaps [Member]
Agreement
Sep. 30, 2014
Foreign Exchange Forward Contracts [Member]
Derivative
Sep. 30, 2014
Warrants [Member]
Warrants
Sep. 30, 2013
Warrants [Member]
Warrants
Sep. 30, 2014
Warrants [Member]
Warrants
Sep. 30, 2013
Warrants [Member]
Warrants
Derivatives And Hedging Activities [Line Items]                    
Warrant Sold             0 0 0 0
Number of foreign exchange forward contracts         6 12        
Notional amount           $ 75.6        
Expiration year of hedge instruments           2014        
Interest rate swaps expiry date   Sep. 30, 2013 Mar. 31, 2016              
Interest Rate Cash Flow Hedge Loss to be Reclassified During Next 12 Months, Net 12.2                  
Derivative fixed interest rate 2.57%                  
Interest rate swaps hedged amount due to future change in interest rate swaps       $ 910.0            
Interest rate swaps effectively converted percent 44.30%