Acquisitions of Businesses - Additional Information (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2019 USD ($) OperatingMetric $ / shares shares	Feb. 06, 2019 USD ($)	Jan. 22, 2019 USD ($)	Apr. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($) shares	Jan. 22, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Business Acquisition [Line Items]
Accrued value of earnout related to acquisition					$ 0				$ 5,952
Goodwill					101,035			$ 101,224
Compli, Inc.
Business Acquisition [Line Items]
Total consideration transferred			$ 17,100
Consideration in cash			11,800			$ 1,600
Accrued value of earnout related to acquisition			3,800
Maximum payout earned							$ 4,000
Earnout recognized at fair value paid					4,000
Goodwill			$ 12,807
Indix Corporation
Business Acquisition [Line Items]
Total consideration transferred		$ 9,100
Consideration in cash		5,500
Accrued value of earnout related to acquisition		2,200
Maximum payout earned		3,000
Goodwill		4,953
Additional cash to be paid, as consideration, after eighteen months		1,400
Indix Corporation | Within Three Months from Closing Date of Acquisition
Business Acquisition [Line Items]
Maximum payout earned		500
Indix Corporation | Within Seven Months from Closing Date of Acquisition
Business Acquisition [Line Items]
Maximum payout earned		650
Indix Corporation | Within 8 Months from Closing Date of Acquisition
Business Acquisition [Line Items]
Maximum payout earned		650
Indix Corporation | Within 12 Months from Closing Date of Acquisition
Business Acquisition [Line Items]
Maximum payout earned		$ 1,200
Indix Corporation | Current Accrued Earnout Liabilities
Business Acquisition [Line Items]
Portion of third milestone payment achieved					$ 30
Portway International, Inc
Business Acquisition [Line Items]
Total consideration transferred	$ 24,300
Consideration in cash	13,000
Accrued value of earnout related to acquisition	9,400
Maximum payout earned	10,000
Goodwill	22,376
Additional cash to be paid, as consideration, after eighteen months	2,000
Acquisition date fair value of cash consideration	$ 1,900
Share price of common shares that could be earned and transferred to seller | $ / shares	$ 83.97
Business combination number of operating metric targets used in earnout payment | OperatingMetric	2
Portway International, Inc | Operating Metrics Targets
Business Acquisition [Line Items]
Maximum payout earned	$ 7,500
Portway International, Inc | Revenue Targets
Business Acquisition [Line Items]
Maximum payout earned	$ 2,500
Portway International, Inc | Operating Metrics Targets One
Business Acquisition [Line Items]
Common stock transferred, shares | shares					44,659
Common stock transferred, value					$ 3,800
Portway International, Inc | Operating Metrics Targets Two | Subsequent Event
Business Acquisition [Line Items]
Common stock transferred, shares | shares				35,727
Common stock transferred, value				$ 3,000
Portway International, Inc | Maximum | Common Stock
Business Acquisition [Line Items]
Number of common shares that could be earned and transferred to seller | shares	119,090