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Revenue From Contracts With Customers - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Retained earnings opening balance sheet adjustment for Topic 606 adoption | $ 1,023,959 |  | $ 795,698
Accounting Standards Update 2014-09 [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Retained earnings opening balance sheet adjustment for Topic 606 adoption |  | $ 1,809 |
Contract assets | $ 3,951 | $ 3,065 |
Accounting Standards Update 2014-09 [Member] | Maximum [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of installation services | 14 days |  |
Company's normal payment terms | 60 days |  |
Warranty period | 24 months |  |
Term of separately priced contracts | 60 months |  |
Accounting Standards Update 2014-09 [Member] | Minimum [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Company's normal payment terms | 30 days |  |
Warranty period | 12 months |  |
Term of separately priced contracts | 12 months |  |

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