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Equity - Additional Information (Detail) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Equity [Line Items] |  |
Ownership percentage of common stock shares outstanding of chairman | 85.00% |
Class B Common Stock Converted Into Class A Common Stock [Member] |  |
Equity [Line Items] |  |
Stock conversion ratio | 100.00% |
Class B Common Stock [Member] |  |
Equity [Line Items] |  |
Common stock, shares outstanding | 5,400,000 | 5,400,000
Common stock voting rights | ten votes on all matters submitted to a vote of shareholders. |
Class B Common Stock [Member] | Board of Directors Chairman [Member] |  |
Equity [Line Items] |  |
Ownership percentage of common stock shares outstanding of chairman | 100.00% |
Common stock, shares outstanding | 5,400,000 |
Class A Common Stock [Member] |  |
Equity [Line Items] |  |
Common stock, shares outstanding | 9,752,531 | 19,130,681
Common stock voting rights | one vote for each share held on all matters submitted to a vote of shareholders. |
Class A Common Stock [Member] | Board of Directors Chairman [Member] |  |
Equity [Line Items] |  |
Common stock, shares outstanding | 348,682 |

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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 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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