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Fair Value Measurement - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Long-term Debt $ 1,262,712 $ 1,370,834
Corporate Bond Securities    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
DIO Corporation's stock volatility factor 40.00%  
Discount rate 9.40%  
Fixed rate senior notes $450 million due August 2021    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Long-term Debt $ 448,965 $ 448,809
Debt, fixed rate 4.10% 4.10%
Private Placement Notes    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Debt, fixed rate 4.10%  
Estimate of Fair Value, Fair Value Disclosure    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Long-term Debt $ 1,290,000 $ 1,387,700
Carrying (Reported) Amount, Fair Value Disclosure    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Long-term Debt 1,262,700 1,370,800
Tranche C | Unsecured Senior Notes    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Senior Notes 450,000  
Tranche B | Unsecured Senior Notes    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Senior Notes 300,000  
Tranche A | Unsecured Senior Notes    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Senior Notes 250,000  
Fixed Rate Senior Notes | U.S. Dollar Denominated Due August 2016    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Long-term Debt $ 299,861 $ 299,775
Debt, fixed rate 2.80% 2.80%