CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Class A ordinary shares/ Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]
Balance at Dec. 31, 2014	$ 4,691,399	$ 15,604	$ 1,436,910	$ 3,466,993	$ (7,990)	$ (220,118)
Balance (in shares) at Dec. 31, 2014		124,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(3,166)	$ 139	397		(3,702)
Net shares issued (acquired) under share-based compensation plans (in shares)		222
Share-based compensation	12,227		12,227
Excess tax benefit (deficit) from share-based compensation plans	(2,322)		(2,322)
Retirement benefit adjustments, net of taxes	6,799					6,799
Dividends	(25,220)			(25,220)
Net income	208,404			208,404
Balance at Jun. 30, 2015	4,888,121	$ 15,743	1,447,212	3,650,177	(11,692)	(213,319)
Balance (in shares) at Jun. 30, 2015		124,786
Balance at Dec. 31, 2015	4,772,459	$ 15,743	1,458,532	3,509,792	(12,223)	(199,385)
Balance (in shares) at Dec. 31, 2015		124,818
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(4,274)	$ 4	(9,250)		4,972
Net shares issued (acquired) under share-based compensation plans (in shares)		600
Share-based compensation	11,413		11,413
Excess tax benefit (deficit) from share-based compensation plans	2,602
Retirement benefit adjustments, net of taxes	5,030					5,030
Dividends	34			34
Net income	339,528			339,528
Balance at Jun. 30, 2016	$ 5,126,792	$ 15,747	$ 1,463,297	$ 3,849,354	$ (7,251)	$ (194,355)
Balance (in shares) at Jun. 30, 2016		125,418