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Stockholders' Equity and Stock-Based Compensation - Summary of Activity Related to Employee Stock Purchase Plan (Detail) - ESPP [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued	148	94	70
Weighted- Average Purchase Price	$ 80.21	$ 38.83	$ 38.98
Total Cash Proceeds	$ 11,863	$ 3,635	$ 2,721

X

- Definition

The cash inflow associated with the amount received from the stock plan during the period.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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