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Reorganization - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended
	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Percentage of workforce reduction	4.00%forr_PercentageOfWorkforceReduction			1.00%forr_PercentageOfWorkforceReduction
Severance costs	$ 3,400,000us-gaap_SeveranceCosts1	$ 1,000,000us-gaap_SeveranceCosts1	$ 800,000us-gaap_SeveranceCosts1	$ 1,800,000us-gaap_SeveranceCosts1
Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected increase in the workforce	7.00%
Forecast [Member] \| Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs					300,000
Forecast [Member] \| Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs					$ 500,000

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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