Quarterly report pursuant to Section 13 or 15(d)

Restricted Common Stock and Stock Appreciation Rights ("SARs") - Summary of SARs Activity (Detail)

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Restricted Common Stock and Stock Appreciation Rights ("SARs") - Summary of SARs Activity (Detail) (SARs [Member])
Sep. 30, 2013
Sep. 30, 2012
SARs [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
SARs outstanding at beginning and end of period 28,733 27,983
Stock vested ending balance, Shares 26,589 22,666