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Organization and Significant Accounting Policies - Summary of Earnings (Loss) Per Share (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of Earnings (Loss) Per Share [Abstract] |  |  |
Basic weighted-average shares | 22,286,000 | 22,709,000 | 24,095,000
Conversion of unsecured loan notes | 7,000 | 7,000 | 7,000
Unexercised options and unvested restricted stock units | 286,000 | 819,000 | 531,000
Diluted weighted-average shares | 22,579,000 | 23,535,000 | 24,633,000

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