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Subsequent Events - Additional Information (Detail) (USD $)
0 Months Ended
Aug. 31, 2014
Sep. 26, 2014
Subsequent Event
Worthington Aritas
Sep. 26, 2014
Subsequent Event
Worthington Aritas
Subsequent Event [Line Items]      
Term loan credit facility, maximum borrowing capacity     $ 32,344,000
Term loan credit facility, term   5 years  
Borrowings outstanding     17,060,000
Term loan credit facility, available for future borrowings $ 413,268,000   $ 15,284,000
Line of credit, variable rate     1.582%