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Equity - Additional Information (Detail) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Equity [Line Items] |  |
Ownership percentage of common stock shares outstanding of chairman | 74.00% |
Class B Common Stock Converted Into Class A Common Stock |  |
Equity [Line Items] |  |
Stock conversion ratio | 1 |
Class A Common Stock |  |
Equity [Line Items] |  |
Common stock, shares outstanding | 19,130,681 | 19,084,958
Class A Common Stock | Board of Directors Chairman |  |
Equity [Line Items] |  |
Common stock, shares outstanding | 348,682 |
Class B Common Stock |  |
Equity [Line Items] |  |
Common stock, shares outstanding | 5,400,000 | 5,400,000
Class B Common Stock | Board of Directors Chairman |  |
Equity [Line Items] |  |
Ownership percentage of common stock shares outstanding of chairman | 100.00% |
Common stock, shares outstanding | 5,400,000 |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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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