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Share-Based Compensation - Schedule of Information with Respect to all Outstanding Restricted Stock and Restricted Stock Units (Parenthetical) (Detail) - shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Adjustment to restricted stock units |  | 163,566
Restricted Stock Units [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vested stock settled in cash | 9,200 |

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- Definition Adjustments to share based compensation restricted stock units number of shares. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Share based compensation arrangement by share based payment awards equity instruments vested settled in cash. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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