Derivatives and Hedging - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule Of Notional Amount Of Derivatives [Line Items]
Notional amount of our derivative assets and liabilities	$ 20.9	$ 3.2
Foreign exchange contract [Member]
Schedule Of Notional Amount Of Derivatives [Line Items]
Notional amount of our derivative assets and liabilities	2.7	2.7
Not designated as hedging instrument [Member]
Schedule Of Notional Amount Of Derivatives [Line Items]
Notional amount of our derivative assets and liabilities	18.2	0.5
Euro-denominated intercompany loans [Member]
Schedule Of Notional Amount Of Derivatives [Line Items]
Notional amount of our derivative assets and liabilities	16.9
Indian rupee [Member]
Schedule Of Notional Amount Of Derivatives [Line Items]
Notional amount of our derivative assets and liabilities	$ 1.3