Annual report pursuant to Section 13 and 15(d)

Credit Facility - Schedule of Limit of Borrowing at Any Point in Time and Total Maximum Advances (Detail)

v3.3.1.900
Credit Facility - Schedule of Limit of Borrowing at Any Point in Time and Total Maximum Advances (Detail) - USD ($)
Jan. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Qualifying Government and Institutional Loans (G&I Facility) [Member]      
Line of Credit Facility [Line Items]      
Limit of Borrowing at any point in time   $ 150,000,000 $ 125,000,000
Maximum Total Advances   450,000,000 375,000,000
Qualifying Government and Institutional Loans (G&I Facility) [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Limit of Borrowing at any point in time $ 250,000,000    
Maximum Total Advances 600,000,000    
Qualifying Project Finance Loans (PF Facility) [Member]      
Line of Credit Facility [Line Items]      
Limit of Borrowing at any point in time   350,000,000 325,000,000
Maximum Total Advances   $ 1,050,000,000 $ 975,000,000
Qualifying Project Finance Loans (PF Facility) [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Limit of Borrowing at any point in time 250,000,000    
Maximum Total Advances $ 900,000,000