License Revenues of Warehouse and Non-Warehouse Product Groups (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Software license revenue	$ 19,542	$ 16,945	$ 17,989	$ 17,107	$ 17,267	$ 14,768	$ 16,136	$ 14,245	$ 71,583	$ 62,416	$ 61,494
Warehouse Product Groups
Revenue from External Customer [Line Items]
Software license revenue									40,084	39,409	40,068
Non-warehouse Product Groups
Revenue from External Customer [Line Items]
Software license revenue									$ 31,499	$ 23,007	$ 21,426