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Revenue Recognition and Sales Commissions - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue Recognition and Sales Commissions [Line Items] |  |  |  |
Revenue recognized in period, included in deferred revenue at beginning of the period | $ 33,800,000 | $ 32,400,000 | $ 61,300,000 | $ 59,000,000.0
Estimated revenue expected to be recognized in future under contract with customers | 420,000,000 |  | $ 420,000,000 |
Description of sales commission plan |  |  | Sales commissions earned by our sales force are considered incremental and recoverable costs of obtaining a contract with a customer. The Company’s sales commission plans for 2018 and 2019 typically include multiple payments, including initial payments in the period a customer contract is obtained and subsequent payments either 15 or 27 months after the initial payment. |
Sales Commissions, amortization term description |  |  | Non-commensurate commissions are amortized over the greater of the expected period of benefit or technological obsolescence period. |
Amortization of deferred commissions | 2,100,000 | 2,000,000.0 | $ 6,269,000 | 5,695,000
Customer Contracts [Member] |  |  |  |
Revenue Recognition and Sales Commissions [Line Items] |  |  |  |
Impairment losses on receivables and contract asset | $ 51,000 | $ 300,000 | $ 99,000 | $ 690,000
Subscription SaaS Services [Member] |  |  |  |
Revenue Recognition and Sales Commissions [Line Items] |  |  |  |
Description of contracts with customer |  |  | Subscription/SaaS contracts are generally non-cancelable, one to five years in length, and billed annually, semi-annually, quarterly, or monthly in advance. |
Subscription SaaS Services [Member] | Minimum [Member] |  |  |  |
Revenue Recognition and Sales Commissions [Line Items] |  |  |  |
Period of contract with customer |  |  | 1 year |
Subscription SaaS Services [Member] | Maximum [Member] |  |  |  |
Revenue Recognition and Sales Commissions [Line Items] |  |  |  |
Period of contract with customer |  |  | 5 years |

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- Definition The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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