Asset Impairment Charges - Additional Information (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
Asset Impairment Charges [Line Items]
Non-cash charges recorded to earnings	$ 256	$ 188	$ 1,751	$ 195	$ 950	$ 7,371	$ 2,814	$ 319	$ 2,390	$ 11,454	$ 11,101
MyWay [Member]
Asset Impairment Charges [Line Items]
Non-cash charges recorded to earnings									800	5,000	11,100
Capitalized Software Development Projects [Member]
Asset Impairment Charges [Line Items]
Non-cash charges recorded to earnings									1,600
dbMotion [Member]
Asset Impairment Charges [Line Items]
Non-cash charges recorded to earnings										$ 6,500