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Debt and Financing Arrangements - Additional Information (Detail) (USD $)
0 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 28, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Jun. 30, 2014
Senior Notes under Master Shelf Agreement [Member]
Dec. 31, 2013
Senior Notes under Master Shelf Agreement [Member]
Jan. 31, 2008
Senior Notes under Master Shelf Agreement [Member]
Nov. 30, 2007
Senior Notes under Master Shelf Agreement [Member]
Apr. 30, 2005
Senior Notes under Master Shelf Agreement [Member]
Sep. 20, 2002
Senior Notes under Master Shelf Agreement [Member]
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Jun. 30, 2014
LIBOR Rate Margin [Member]
Minimum [Member]
Jun. 30, 2014
Revolving credit facility [Member]
Jun. 28, 2013
Revolving credit facility [Member]
Jun. 28, 2013
Revolving credit facility [Member]
Credit Agreement Before Amended [Member]
Jun. 30, 2014
Credit Agreement with Banks [Member]
Dec. 31, 2013
Credit Agreement with Banks [Member]
Jun. 30, 2013
Credit Agreement with Banks [Member]
Jun. 30, 2014
Credit Agreement with Banks [Member]
LIBOR Rate Margin [Member]
Maximum [Member]
Jun. 30, 2014
Credit Agreement with Banks [Member]
Base rate margin [Member]
Minimum [Member]
Jun. 30, 2014
Credit Agreement with Banks [Member]
Base rate margin [Member]
Maximum [Member]
Line of Credit Facility [Line Items]                                            
Borrowing capacity under credit agreement                           $ 200,000,000 $ 200,000,000 $ 150,000,000            
Amendment line of credit facility expiration year and month 2018-06                                          
Line of credit facility expiration year and month                           2018-06                
Additional borrowing capacity under revolving credit facility                           40,000,000                
Rate margin                         1.25%             2.50% 0.125% 0.50%
Letter of credit fee                     1.375% 2.625%                    
Letter of credit unused portion fee                     0.20% 0.325%                    
Company's leverage ratio   3.00%                                        
Letter of credit facility outstanding amount   47,100,000   59,100,000                                    
Total debt   95,740,000 76,883,000   25,000,000 28,571,000                     70,740,000 48,312,000 59,400,000      
Senior notes issued, value             25,000,000 25,000,000   100,000,000                        
Senior notes authorized amount                 $ 150,000,000 $ 125,000,000                        
Interest rate on notes             6.17% 6.14%   7.38%                        
Senior credit facility, Interest rate terms description         Payments due under the $100 million Senior Notes were interest only until June 30, 2006 and at that time semi-annual principal payments began with the final payment made December 2013. The November 2007 issuance of $25 million Senior Notes has a fixed interest rate of 6.14 percent. The January 2008 issuance of $25 million Senior Notes has a fixed interest rate of 6.17 percent. Payments due for both $25 million issuances were interest only until June 30, 2011 and at that time semi-annual principal payments began with the final payments due December 31, 2017.