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Business - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2015
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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