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Debt - Revolving Credit Facility - Additional Information (Detail)
9 Months Ended
Sep. 30, 2016
USD ($)
fiscal_quarter
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Revolving credit facility $ 211,084,000 $ 109,947,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity on line of credit 500,000,000  
Revolving Credit Facility [Member] | Restated Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity on line of credit $ 500,000,000.0  
Maturity date on credit facility Apr. 12, 2019  
Maximum capitalization ratio 60.00%  
Minimum consolidated tangible net worth requirement $ 1,500,000,000  
Revolving credit facility $ 40,000,000  
Maximum consecutive days for financial covenant 5 days  
Number of consecutive fiscal quarters in which equity cure right can be used twice (in fiscal quarter) | fiscal_quarter 4  
Maximum number of times equity cure right can be exercised 5