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Share Capital - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Oct. 07, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, authorized | 50,000,000 |  | 50,000,000 |  |  |  |  |  |
Preferred stock, par value | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Preferred stock, issued | 0 |  | 0 |  |  |  |  |  |
Class A Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, authorized | 50,000,000 |  | 50,000,000 |  |  |  |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Common stock, issued | 13,442,759 |  | 13,442,759 |  |  | 13,508,318 |  |  | 13,572,265
Common stock, outstanding | 13,442,759 | 13,515,012 | 13,442,759 | 13,515,012 | 13,496,783 | 13,508,318 | 13,489,162 | 13,572,265 | 13,572,265
Repurchase of class A common stock |  |  |  |  |  |  |  |  | 675,000
Percentage of repurchase of class A common stock |  |  |  |  |  |  |  |  | 5.00%
Repurchase and cancelled stock | 119,251 | 15,000 | 130,786 | 114,900 |  |  |  |  |
Total consideration of repurchase and cancelled stock |  |  | $ 2.3 |  |  |  |  |  |
Repurchase and cancelled stock per share |  |  | $ 17.69 |  |  |  |  |  |
Class B Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, authorized | 99,680 |  | 99,680 |  |  |  |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Common stock, issued | 99,680 |  | 99,680 |  |  | 99,680 |  |  |
Common stock, outstanding | 99,680 |  | 99,680 |  |  | 99,680 |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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