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Stock Based Compensation - Additional Information (Details)	1 Months Ended	12 Months Ended
	Jul. 31, 2009	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 shares	Dec. 31, 2015	Aug. 31, 2019 $ / shares	Jul. 31, 2019 USD ($) $ / shares shares	May 01, 2019 shares	Aug. 31, 2018 $ / shares	Jul. 31, 2018 USD ($) $ / shares shares	Aug. 31, 2017 $ / shares	Jul. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares available to be granted under award stock plan		28,800,000
Incremental increases in average stock price from initial grant price		20.00%
Share-based compensation arrangement by share-based payment award, award requisite service period	20 years	15 years
Attainment age of stock plan		attainment of age 64
Share-based compensation arrangement by share-based payment award, options, grants in period, gross		10,239,624
Share based compensation arrangement by share based payment award equity instruments other than options awarded shares outstanding number		1,051,292
Share based compensation arrangement by share based payment award equity instruments other than options distributed shares outstanding number		9,188,332
Share-based compensation, shares authorized under stock option plans, exercise price range, lower range limit | $ / shares		$ 8.30
Share-based compensation, shares authorized under stock option plans, exercise price range, upper range limit | $ / shares		$ 12.84
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value | $		$ 3,500	$ 11,900	$ 6,300
Number of shares authorized		34,000,000
Maximum employee subscription rate		10.00%
Compensation cost not yet recognized | $		$ 109,700,000
Compensation cost not yet recognized, period for recognition		3 years 3 months 7 days
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant		6,340,598
Threshold period worked per week by employees		20
Allotted value maximum | $		$ 25,000,000
Subscription period beginning		August 1st
Subscription period ending		July 31st
Purchase price of common stock, percentage		85.00%
Percentage of market price		15.00%
Value of one year stock option percentage		85.00%
Estimated fair value per share option | $ / shares							$ 7.46			$ 5.88		$ 4.32
Stock awarded								976,303			985,601		1,058,024
Shares issued aggregate purchase value | $								$ 24,000,000.0			$ 18,700,000		$ 16,400,000
Shares issued aggregate purchase price per share | $ / shares								$ 24.63			$ 18.96		$ 15.52
Shares held in employee stock option plan, suspense shares		419,446	402,349	435,027
Cash received from proceeds by participants | $		$ 12,800,000	$ 9,900,000	$ 8,200,000
2019 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of stock reserved for issuance under stock incentive plans									2,283,475
Number of shares available for grant		9,515,603							6,957,897
2010 SIP and 2019 SIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment award equity instruments other than options awarded shares outstanding number		8,070,576	6,595,319	4,809,604	4,802,588
2010 SIP and 2019 SIP | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period		5 years
Performance measurement period		3 years
Percentage of payout					0.00%	0.00%
2010 SIP and 2019 SIP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period		10 years
Performance measurement period		5 years
Percentage of payout					200.00%	100.00%
2010 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued to directors shares		27,885	26,620	22,700

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