Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended
	Aug. 22, 2013	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount		$ 3.6
Loss contingency accrual		3.6	$ 1.3
Insurance Settlements Receivable		2.8	$ 0.5
Guarantees in the form of letters of credit		$ 5.2		$ 5.1
Claim against damage on reputation and defamation
Commitments And Contingencies [Line Items]
Loss contingency damages sought value	$ 50.0
Claim against breach of contract
Commitments And Contingencies [Line Items]
Loss contingency damages sought value	$ 50.0