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Deferred Revenue-Entry of Right-to-Use Contracts and Deferred Commission Expense - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Deferred revenue as of December 31, | $ 85,596 | $ 81,484 |  |
Cumulative effect of change in accounting principle |  |  |  | $ (15,186)
Right-to-use contract upfront payments, deferred, net |  | 14,132 |  |
Revenue recognized from right-to-use contract upfront payments | (7,811) | (10,020) | $ (9,248) |
Right-to-use contract upfront payments, deferred, net | 7,380 | 4,112 |  |
Deferred revenue—upfront payments from right-to-use contracts as of December 31, | 116,363 | 85,596 | 81,484 |
Movement in Deferred Costs [Roll Forward] |  |  |  |
Deferred commission expense, as of January 1, | 31,443 | 31,375 |  |
Deferred commission expense | 4,274 | 4,577 |  |
Commission expense recognized | 3,609 | 4,509 |  |
Net increase in deferred commission expense | 665 | 68 |  |
Deferred commission expense, as of December 31, | $ 40,308 | $ 31,443 | $ 31,375 |
Right-to-use contract upfront payments, deferred, net | Cumulative effect of change in accounting principle | Accounting Standards Update 2014-09 |  |  |  |
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | 23,387
Deferred Commission Expense | Cumulative effect of change in accounting principle | Accounting Standards Update 2014-09 |  |  |  |
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | $ 8,200

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