Quarterly report pursuant to Section 13 or 15(d)

Insurance Receivable - Additional Information (Detail)

v2.4.0.6
Insurance Receivable - Additional Information (Detail) (Maintenance And Service, USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Maintenance And Service
 
Business Interruption Loss [Line Items]  
Estimated cost to repair graving dock, recoverable by insurance $ 7.5
Recoverable repair expenses, net of related deductibles $ 2.7