Annual report pursuant to Section 13 and 15(d)

Hurricane Remediation and Insurance Claims - Additional Information (Detail)

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Hurricane Remediation and Insurance Claims - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2008
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Interruption Loss [Line Items]        
Retention amount per occurrence $ 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 proceeds   6.7 2.9 20.9
Cumulative insurance recoveries related to hurricanes   $ 148.9