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Restatement of the Condensed Consolidated Financial Statements - Effects of Restatement on Condensed Consolidated Balance Sheet (Parenthetical) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Trade accounts receivable, allowances $ 11,731 [1] $ 13,543
Common shares, par value $ 0.10 [1] $ 0.10
Common shares, authorized 50,000,000 [1] 50,000,000
Common shares, issued 19,453,294 [1] 19,339,329
Common shares, outstanding 19,453,294 [1] 19,339,329
[1] Unaudited