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Summary of Significant Accounting Policies - Weighted Average Shares of Unvested Restricted Stock (Detail) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Unvested restricted stock | 344 | 293 | 238

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- Definition Share based compensation arrangement by share based payment award equity instruments other than option nonvested weighted average number. + References No definition available. + Details
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- References No definition available. + Details
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