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Unaudited Supplemental Pro Forma Information (Detail) - Spectrum Inc. - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |
Total revenue | $ 44,830 | $ 39,875
Net income | $ 3,939 | $ 3,266
Earnings per share: |  |
Basic | $ 0.09 | $ 0.08
Diluted | $ 0.09 | $ 0.08

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