XML 80 R63.htm IDEA: XBRL DOCUMENT v3.10.0.1
Derivatives Hedges and Financial Instruments - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
$ / Transaction
shares
Dec. 31, 2017
USD ($)
$ / shares
$ / Transaction
shares
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Series E redeemable preferred - embedded derivative $ 1,642,000 $ 2,660,000
Carbon credit fair value per unit | $ / Transaction 2.35 0
Embedded Derivative [Member]    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Series E redeemable preferred - embedded derivative $ 0  
Participating right in dividends and liquidating distributions expressed in number of common shares | shares 303,646 303,646
Embedded Derivative [Member] | Common Stock Shares [Member]    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Common stock per share | $ / shares $ 5.52 $ 8.76