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Reorganization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011 Employee	Dec. 31, 2014	Dec. 31, 2013 Employee	Dec. 31, 2012 Employee
Restructuring and Related Activities [Abstract]
Severance and related costs	$ 0.4us-gaap_SeveranceCosts1	$ 1.8us-gaap_SeveranceCosts1	$ 1.9us-gaap_SeveranceCosts1	$ 1.4us-gaap_SeveranceCosts1
Percentage of workforce reduction		1.00%forr_PercentageOfWorkforceReduction	2.50%forr_PercentageOfWorkforceReduction
Number of additional employees terminated related to sales reorganization and other cost reduction initiatives			31	17
Number of sales employees for which severance was incurred based on statutory termination benefits	3

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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