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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
GCP I
Fair Value, Measurement Inputs, Disclosure [Line Items]
Investment related to noncontrolling interests	$ 0.1	$ 0.1
GCP II
Fair Value, Measurement Inputs, Disclosure [Line Items]
Investment related to noncontrolling interests	0.6	0.9
Barrow Street
Fair Value, Measurement Inputs, Disclosure [Line Items]
Other commitment	$ 0.3

Total of all Partners' Capital (deficit) items which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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