Original and Further Restatement of the Consolidated Financial Statements - Effects of Further Restatement on Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Trade accounts receivable, allowances	$ 8,971	$ 9,111
Common shares, par value	$ 0.10	$ 0.10
Common shares, authorized	50,000,000	50,000,000
Common shares, issued	18,534,625	18,102,335
Common shares, outstanding	18,534,625	18,102,335
Previously Reported [Member]
Trade accounts receivable, allowances		9,111
Common shares, par value		$ 0.10
Common shares, authorized		50,000,000
Common shares, issued		18,102,335
Common shares, outstanding		18,102,335
Restatement Adjustments [Member]
Trade accounts receivable, allowances		$ 0