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Transition Costs - Additional Information (Detail) - USD ($) | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
General and Administrative Expenses [Member] |  |
Transition Costs [Line Items] |  |
Non-cash charges associated with modifications to existing stock grants held by the retiring executives and expenses associated with the onboarding of the Company's new President and CEO | $ 0 | $ 8,628,000

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- Definition Non cash charges related to equity based compensation of retiring executives and expenses associated with onboarding new executives. + References No definition available. + Details
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Period Type: | duration

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- Definition Transition Costs. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |