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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	May 01, 2017	Apr. 26, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense related to ESPP			$ 38,513	$ 22,546	$ 3,010
Software and Capitalized Software Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Capitalized compensation cost			3,300	1,800	$ 200
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense related to ESPP			38,500	$ 22,500
Total unrecognized compensation cost related to unvested restricted stock			$ 30,300
Unrecognized compensation expected to be recognized			2 years 1 month 6 days
Restricted Stock [Member] | LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted shares of common stock issued	9,870	613,677
Restricted Stock [Member] | Vest 50% if Company's total enterprise value equals or exceeds $4.15 billion [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Market-based vesting percentage, restricted shares		50.00%
Total enterprise value		$ 4,150,000
Restricted Stock [Member] | Vest 50% if Company's total enterprise value equals or exceeds $4.45 billion [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Market-based vesting percentage, restricted shares		50.00%
Total enterprise value		$ 4,450,000
Restricted Stock [Member] | Market-based Vesting Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted common stock, expiration period		6 years
Restricted Stock [Member] | Time-based Vesting Conditions [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation award vesting period		2 years
Restricted Stock [Member] | Time-based Vesting Conditions [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation award vesting period		5 years

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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