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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplier Concentration Risk | Cost of Goods, Total |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of purchases from key suppliers | 84.00% | 85.00% | 84.00%
Moss & Associates LLC | Customary Payments for Remodeling of Corporate Headquarters |  |  |
Related Party Transaction [Line Items] |  |  |
Payment for related party transaction | $ 951 | $ 291 |
Amount payable to related party | 131 |  |
Greenberg Traurig, P.A. | Customary Fees for Legal Services |  |  |
Related Party Transaction [Line Items] |  |  |
Payment for related party transaction | 475 |  |
Amount payable to related party | 0 |  |
Carrier and Its Affiliates | Supplier Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Amount payable to Carrier and its affiliates, net of receivables | 75,000 | 63,000 |
Revenues from sales to Carrier and its affiliates | $ 64,000 | $ 56,000 | $ 62,000
Carrier and Its Affiliates | Supplier Concentration Risk | Cost of Goods, Total |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of purchases from key suppliers | 62.00% | 62.00% | 62.00%

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