Annual report pursuant to Section 13 and 15(d)

Hurricane Remediation and Insurance Claims - Additional Information (Details)

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Hurricane Remediation and Insurance Claims - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2008
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Insurance [Abstract]        
Retention amount per occurrence $ 10,000,000      
Maximum insurance coverage policy limit due to named windstorms for per incident 150,000,000      
Maximum insurance coverage policy limit except for property damage due to named windstorms $ 250,000,000      
Insurance proceeds   $ 200,000 $ 12,200,000 $ 6,700,000
Cumulative insurance recoveries related to hurricanes     $ 161,200,000