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Organization and Basis of Presentation - Additional Information (Detail) | 1 Months Ended | 6 Months Ended
--- | --- | ---
May. 31, 2014 $ / shares | Feb. 28, 2014 | Jun. 30, 2015 Director
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |
Dividend declared | $ / shares | $ 0.02 |  |
Contran |  |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |
Parent company ownership interest |  |  | 93.00%
Common stock, voting rights |  |  | The voting agreement expires in February 2017 (unless Ms. Lisa Simmons, Ms. Connelly and Ms. Annette Simmons otherwise mutually agree), and the ability of Ms. Lisa Simmons, Ms. Connelly, and Ms. Annette Simmons to each designate one member of the Contran board is dependent upon each of their continued beneficial ownership of at least 5% of the combined voting stock of Contran.
Voting agreement expiration date |  |  | 2017-02
Size of board of directors |  |  | 5
Contran | Minimum |  |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |
Minimum percentage of voting stock ownership required to designate a board member |  | 5.00% |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: 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 + Details
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