Quarterly report pursuant to Section 13 or 15(d)

Selected Balance Sheet Data - Additional Information (Detail)

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Selected Balance Sheet Data - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2014
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Mar. 31, 2013
Schedule Of Accrued Expenses [Line Items]          
SARs frozen liability amount   $ 20,296,000 $ 20,296,000 $ 19,970,000 $ 20,000,000
SARs Liability frozen value date     Mar. 31, 2013    
SARs liability interest accrual commencement date     Jan. 01, 2014    
Interest expense   397,000 1,202,000    
Treasury note term       10 years  
Base spread on SARs liability variable rate 2.00%        
SARs liability interest accrual rate 5.03%        
Stock appreciation rights liability distribution     412,000    
Maximum payment deferral period for certain commissions payable     3 years    
Fair value of deferred compensation plan assets     110.00%    
SARs [Member]
         
Schedule Of Accrued Expenses [Line Items]          
Interest expense   236,000 738,000    
Stock appreciation rights liability distribution   $ 412,000