Original and Further Restatement of the Consolidated Financial Statements - Effects of Restatements on Condensed Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Trade accounts receivable, allowances	$ 8,841	[1]	$ 9,111
Common shares, par value	$ 0.10	[1]	$ 0.10
Common shares, authorized	50,000,000	[1]	50,000,000
Common shares, issued	18,365,910	[1]	18,102,335
Common shares, outstanding	18,365,910	[1]	18,102,335
Further Restatement [Member]
Trade accounts receivable, allowances	8,841		9,111
Common shares, par value	$ 0.10		$ 0.10
Common shares, authorized	50,000,000		50,000,000
Common shares, issued	18,365,910		18,102,335
Common shares, outstanding	18,365,910		18,102,335
Originally Reported [Member] | Further Restatement [Member]
Trade accounts receivable, allowances	8,841		9,111
Common shares, par value	$ 0.10		$ 0.10
Common shares, authorized	50,000,000		50,000,000
Common shares, issued	18,365,910		18,102,335
Common shares, outstanding	18,365,910		18,102,335
Further Restatement Adjustments [Member] | Further Restatement [Member]
Trade accounts receivable, allowances	$ 8,841		$ 9,111

[1] Unaudited