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Debt - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]          
Amount of difference between fair value and book value $ 6,000,000   $ 6,000,000   $ (39,700,000)
Weighted average interest rate on borrowings     2.30% 2.00%  
Interest income from investments/other 1,600,000 $ 1,200,000 $ 2,900,000 $ 2,900,000  
Revolving Credit Facility          
Debt Instrument [Line Items]          
Total amount of revolving credit agreement 1,500,000,000   1,500,000,000    
Credit Agreements          
Debt Instrument [Line Items]          
Allowable annual dividend payment under credit agreement $ 225,000,000   $ 225,000,000