Debt - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended					6 Months Ended	12 Months Ended								12 Months Ended		0 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Oct. 10, 2012	Oct. 21, 2011	Jun. 30, 2013 Convertible Senior Notes [Member]	Jun. 30, 2013 Convertible Senior Notes [Member]	Oct. 10, 2012 Convertible Senior Notes [Member]	Jun. 30, 2012 Convertible Senior Notes [Member]	Oct. 10, 2012 Letters of Credit [Member]	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Term Facility [Member]	Oct. 10, 2012 Term Facility [Member]	Jun. 30, 2013 Revolving Credit Facility [Member]	Oct. 10, 2012 Revolving Credit Facility [Member]	Oct. 10, 2012 Multi-Currency Revolving Credit Facility [Member]	Oct. 10, 2012 Term Loan and Revolving Credit Facility [Member]	Jun. 30, 2013 Cash [Member]	Jun. 30, 2013 Registration Rights Agreement [Member] Convertible Senior Notes [Member]
Debt Disclosure [Line Items]
Short-term borrowings outstanding	$ 4,930,000	$ 4,930,000	$ 227,000
Lines of credit	55,700,000	55,700,000	17,800,000
Unsecured revolving credit facility, period of agreement, in years																		5 years	5 years
Current borrowing capacity																		550,000,000
Line of credit facility, maximum borrowing capacity											60,000,000
Increase in line of credit facility					250,000,000
Aggregate revolving commitment																		750,000,000	300,000,000
Required consolidated EBITDA to consolidated cash interest expense as per New Credit Agreement												3.5:1.0
Required consolidated total debt to consolidated EBITDA as per New Credit Agreement													3.5:1.0
Required consolidated total debt to consolidated EBITDA as per New Credit Agreement after acquisition	4.0:1.0	4.0:1.0
Amount of outstanding letters of credit																6,800,000	8,700,000
Borrowings under the Term Facility														285,000,000	300,000,000
Convertible senior notes paid									400,000,000
Current portion of long-term debt	30,000,000	30,000,000	395,409,000													30,000,000
Long-term debt non current	255,043,000	255,043,000	0													255,000,000
Unused available credit																743,200,000
Fees and other expenses																6,100,000
Write-off of debt issuance costs																1,100,000
Convertible Senior Notes outstanding										400,000,000
Debt instrument, issuance date	Oct. 23, 2007
Debt instrument, maturity date							Oct. 15, 2012
Effective interest rate, Convertible Senior Notes	5.60%	5.60%					1.25%	1.25%
Repayment of principal borrowings fund																				100,000,000
Initial conversion rate, shares per principal amount								9.6154
Principal amount of Convertible Senior Notes		1,000						1,000
Initial conversion price per share							$ 104	$ 104
Effective interest rate, Convertible Senior Notes		75,700,000
Proceeds received attributed to conversion feature of Convertible Senior Notes		48,300,000
Period of effectiveness of registration statement, maximum																					Five years and three months
Number of business days to file registration statement						7
Interest expense, net		12,868,000	20,126,000	22,576,000
Interest expense, gross		15,300,000	27,000,000	32,500,000
Non-cash interest expense		8,500,000	19,100,000	19,300,000
Cash interest expense, net		6,800,000	7,900,000	13,200,000
Interest income		2,400,000	6,900,000	9,900,000
Cash paid for interest, net of cash interest received		$ 6,800,000	$ 3,100,000	$ 5,000,000