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Debt - Narrative (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Debt Instrument [Line Items]      
Amount of difference between fair value and book value $ 159,400,000   $ 39,700,000
Weighted average interest rate on borrowings 2.30% 2.10%  
Interest paid, net of interest received $ 1,300,000 $ 1,700,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Total amount of revolving credit agreement 1,500,000,000    
Credit Agreements      
Debt Instrument [Line Items]      
Allowable annual dividend payment under credit agreement $ 225,000,000