Annual report pursuant to Section 13 and 15(d)

Schedule ii - Valuation and Qualifying Accounts (Detail)

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Schedule ii - Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 979 $ 1,370 $ 2,222
Additions Charged to Costs and Expenses 1,794 1,677 1,944
Deduction (1,686) [1] (2,068) [1] (2,796) [1]
Balance at End of Year $ 1,087 $ 979 $ 1,370
[1] Uncollectible accounts written off, net of recoveries.