CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign currency translation adjustment, tax	$ 4,099	$ (4,736)
Reclassification of cash flow hedge into earnings, tax	660
Unrealized gain on cash flow hedges, of tax	(1,287)	(268)
Issuance of common stock in connection with initial public offering, shares	21,275,000
Stock options exercised, related tax benefits	19,761	64,914
Purchase of stock at cost, shares		1,500
Common Stock [Member]
Issuance of common stock in connection with initial public offering, shares	21,275,000
Additional Paid - in Capital [Member]
Issuance of common stock in connection with initial public offering, shares	21,275,000
Stock options exercised, related tax benefits	19,761	64,914
Treasury Stock [Member]
Purchase of stock at cost, shares		1,500
Accumulated Other Comprehensive Income (Loss) [Member]
Foreign currency translation adjustment, tax	4,099	(4,736)
Reclassification of cash flow hedge into earnings, tax	660
Unrealized gain on cash flow hedges, of tax	$ (1,287)	$ (268)