Debt and Financing Arrangements - Additional Information (Detail) (USD $)
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0 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||||
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Jun. 28, 2013
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Jun. 30, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Jun. 30, 2014
Senior Notes under Master Shelf Agreement [Member]
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Dec. 31, 2013
Senior Notes under Master Shelf Agreement [Member]
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Jan. 31, 2008
Senior Notes under Master Shelf Agreement [Member]
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Nov. 30, 2007
Senior Notes under Master Shelf Agreement [Member]
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Apr. 30, 2005
Senior Notes under Master Shelf Agreement [Member]
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Sep. 20, 2002
Senior Notes under Master Shelf Agreement [Member]
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Jun. 30, 2014
Minimum [Member]
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Jun. 30, 2014
Maximum [Member]
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Jun. 30, 2014
LIBOR Rate Margin [Member]
Minimum [Member]
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Jun. 30, 2014
Revolving credit facility [Member]
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Jun. 28, 2013
Revolving credit facility [Member]
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Jun. 28, 2013
Revolving credit facility [Member]
Credit Agreement Before Amended [Member]
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Jun. 30, 2014
Credit Agreement with Banks [Member]
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Dec. 31, 2013
Credit Agreement with Banks [Member]
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Jun. 30, 2013
Credit Agreement with Banks [Member]
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Jun. 30, 2014
Credit Agreement with Banks [Member]
LIBOR Rate Margin [Member]
Maximum [Member]
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Jun. 30, 2014
Credit Agreement with Banks [Member]
Base rate margin [Member]
Minimum [Member]
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Jun. 30, 2014
Credit Agreement with Banks [Member]
Base rate margin [Member]
Maximum [Member]
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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. |