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Business - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |
Company's ownership percent | 89.20% | 100.00%
Maryland [Member] |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |
Company re-incorporated date | Mar. 24, 2011 |
Delaware [Member] |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |
Company re-incorporated date | May 25, 2004 |
California [Member] |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |
Company originally incorporated date | Jun. 14, 1997 |

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