Other Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Intangible Assets [Line Items]
Loss on impairment of software		$ 6,500	$ 11,441	$ 2,277	$ 0
Ongoing contractual fees accrued	$ 5,300		5,300
Maintenance expense			1,000
Other Intangible Assets
Other Intangible Assets [Line Items]
Amortization expense			49,500	45,400	49,900
Software packages
Other Intangible Assets [Line Items]
Amortization expense			$ 15,900	$ 14,300	$ 20,100
Business Solutions
Other Intangible Assets [Line Items]
Loss on impairment of software	$ 5,000