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Subsequent Events (Detail) - Line of Credit [Member] - Deutsche Bank Repurchase Facility [Member]
Apr. 30, 2017
EUR (€)
Apr. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 29, 2016
USD ($)
Subsequent Event [Line Items]          
Maximum Amount of Borrowings     $ 355,200,000 $ 300,000,000 $ 355,200,000
General Facility [Member]          
Subsequent Event [Line Items]          
Maximum Amount of Borrowings     $ 300,000,000    
Subsequent Event [Member] | General Facility [Member]          
Subsequent Event [Line Items]          
Maximum Amount of Borrowings € 45,000,000 $ 450,000,000