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Summary of Long-term Debt (Parenthetical) (Detail)
1 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
May. 31, 2013
2.375% Senior Notes due 2018        
Debt Instrument [Line Items]        
Debt instrument, interest rate   2.375% 2.375% 2.375%
Debt instrument, maturity date   Jun. 01, 2018 Jun. 01, 2018  
Senior notes maturity , period   5 years 5 years  
3.750% Senior Notes due 2023        
Debt Instrument [Line Items]        
Debt instrument, interest rate   3.75% 3.75% 3.75%
Debt instrument, maturity date   Jun. 01, 2023 Jun. 01, 2023  
Senior notes maturity , period   10 years 10 years  
1.38% note payable | Due January 31, 2017        
Debt Instrument [Line Items]        
Debt instrument, interest rate   1.38% 1.38%  
Debt instrument, maturity date   Jan. 31, 2017 Jan. 31, 2017  
1.50% note payable | Due September 30, 2016        
Debt Instrument [Line Items]        
Debt instrument, interest rate   1.50% 1.50%  
Debt instrument, maturity date   Sep. 30, 2016 Sep. 30, 2016  
1.50% note payable | Due January 31, 2016        
Debt Instrument [Line Items]        
Debt instrument, interest rate   1.50% 1.50%  
Debt instrument, maturity date   Jan. 31, 2016 Jan. 31, 2016  
1.50% note payable | Due December 31, 2015        
Debt Instrument [Line Items]        
Debt instrument, interest rate   1.50% 1.50%  
Debt instrument, maturity date   Dec. 31, 2015 Dec. 31, 2015  
1.50% note payable | Due July 31, 2015        
Debt Instrument [Line Items]        
Debt instrument, interest rate   1.50% 1.50%  
Debt instrument, maturity date   Jul. 31, 2015 Jul. 31, 2015  
LIBOR + 2.0%, unsecured term loan        
Debt Instrument [Line Items]        
Debt instrument, maturity date Dec. 07, 2017 Dec. 07, 2017 Dec. 07, 2017  
LIBOR + 2.0%, unsecured term loan | London Interbank Offered Rate        
Debt Instrument [Line Items]        
Debt instrument, margin rate   2.00% 2.00%  
Unsecured term loan due on April 08, 2018 | LIBOR + 1.125%, unsecured term loan        
Debt Instrument [Line Items]        
Debt instrument, maturity date   Apr. 08, 2018 Apr. 08, 2018  
Unsecured term loan due on April 08, 2018 | LIBOR + 1.125%, unsecured term loan | London Interbank Offered Rate        
Debt Instrument [Line Items]        
Debt instrument, margin rate   1.125% 1.125%  
Unsecured term loan due on September 10, 2017 | LIBOR + 1.125%, unsecured term loan        
Debt Instrument [Line Items]        
Debt instrument, maturity date   Sep. 10, 2017 Sep. 10, 2017  
Unsecured term loan due on September 10, 2017 | LIBOR + 1.125%, unsecured term loan | London Interbank Offered Rate        
Debt Instrument [Line Items]        
Debt instrument, margin rate   1.125% 1.125%