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Subsequent Event - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended				6 Months Ended	0 Months Ended
	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015	Jun. 30, 2015	Feb. 11, 2015
Restructuring Cost and Reserve [Line Items]
Percentage of workforce reduction		1.00%forr_PercentageOfWorkforceReduction	2.50%forr_PercentageOfWorkforceReduction
Expected pre-tax expenses related to cash severance and employee termination benefit cost	$ 0.4us-gaap_SeveranceCosts1	$ 1.8us-gaap_SeveranceCosts1	$ 1.9us-gaap_SeveranceCosts1	$ 1.4us-gaap_SeveranceCosts1
Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected increase in the workforce					7.00%
Minimum [Member] \| Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected pre-tax expenses related to cash severance and employee termination benefit cost						3.5
Maximum [Member] \| Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected pre-tax expenses related to cash severance and employee termination benefit cost						$ 4.0
Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Percentage of workforce reduction							4.00%

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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