Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.8.0.1
Subsequent Events - Additional Information (Detail)
1 Months Ended
Apr. 30, 2018
USD ($)
a
Mar. 31, 2018
USD ($)
Subsequent Event [Line Items]    
Dividends Payable | $   $ 8,000,000
Subsequent Event    
Subsequent Event [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%  
Dividends | $ $ 10,000,000  
Subsequent Event | Building [Member]    
Subsequent Event [Line Items]    
Area of Land | a 89,000  
Subsequent Event | Real Estate [Member]    
Subsequent Event [Line Items]    
Area of Land | a 109,000