Derivatives (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012
Derivative [Line Items]
Foreign exchange losses due to revaluation of derivative instruments held		$ 1,400,000		$ 1,400,000
Number of interest rate swap contracts			1		1
Interest Rate Risk Management [Member]
Derivative [Line Items]
Amount expected to be reclassified from AOCI to earnings within the next 12 months			600,000
Notional amount of interest rate derivatives	20,600,000		20,600,000		20,300,000
Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Foreign contracts maturing within 12 months			216,500,000		154,800,000
Fair value of foreign currency derivatives not designated as hedges, asset	1,600,000		1,600,000		8,800,000
Cash Flow Hedging [Member]
Derivative [Line Items]
Foreign contracts maturing within 12 months			433,900,000		638,300,000
Ineffectiveness recognized	0	0	0	0
Fair value of derivatives contracts			2,700,000		29,800,000
Amount expected to be reclassified from AOCI to earnings within the next 12 months			1,300,000
Recognized net gain (losses) related to the change in forward points	$ 800,000	$ 1,800,000	$ 1,400,000	$ 5,400,000
Maximum [Member]
Derivative [Line Items]
Foreign exchange contracts maturity period, years			1