Annual report pursuant to Section 13 and 15(d)

Hurricane Remediation and Insurance Claims - Additional Information (Detail)

v2.4.0.6
Hurricane Remediation and Insurance Claims - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 51 Months Ended
Dec. 31, 2008
Sep. 30, 2008
Dec. 31, 2012
Dec. 31, 2012
Business Interruption Loss [Line Items]        
Retention amount per occurrence $ 10.0 $ 10.0    
Maximum insurance coverage policy limit due to named windstorms for per incident     150.0  
Maximum insurance coverage policy limit except for, property damage due to named windstorms     250.0  
Insurance recoveries related to hurricanes       $ 142.2