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Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Number of Options |  |  |
Number of Options, Beginning balance | 22,022 | 82,166 | 140,356
Number of Options, Exercised | (7,438) | (60,144) | (58,190)
Number of Options, Ending balance | 14,584 | 22,022 | 82,166
Number of Options, Vested at December 31 | 14,584 | 22,022 | 82,166
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price, Beginning balance | $ 7.63 | $ 7.63 | $ 7.63
Weighted Average Exercise Price, Exercised | $ 7.63 | $ 7.63 | $ 7.63
Weighted Average Exercise Price, Ending balance | $ 7.63 | $ 7.63 | $ 7.63
Weighted Average Exercise Price, Vested options | $ 7.63 | $ 7.63 | $ 7.63
Aggregate Intrinsic Value |  |  |
Aggregate Intrinsic Value, Ending balance | $ 375 |  |
Aggregate Intrinsic Value, Vested options | $ 375 |  |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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