Consolidated Statements Of Changes In Equity (USD $)	Total	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interests - Non-Redeemable [Member]	Total Equity (Permanent) [Member]	Non-controlling Interests - Redeemable [Member]
Balance at Dec. 31, 2010		$ 171,522,000	$ 393,061,000	$ (515,000)	$ 12,799,000	$ 576,867,000	$ 147,740,000
Balance (in shares) at Dec. 31, 2010		31,040,000
Issuance of restricted common stock (in shares)		277,000
Cancellation of restricted common stock		(9,000)				(9,000)
Cancellation of restricted common stock (in shares)		(1,000)
Stock options exercised		6,872,000				6,872,000
Stock options exercised (in shares)	374,350	374,000
Stock repurchased		(10,007,000)				(10,007,000)
Stock repurchased (in shares)		(406,000)
Share-based compensation, value	6,178,000	6,178,000				6,178,000
Tax benefit related to exercise of stock options		649,000				649,000
Net earnings	190,114,000		49,997,000		10,181,000	60,178,000	129,936,000
Distributions to noncontrolling interests, net of capital contributions					(9,502,000)	(9,502,000)	(129,979,000)
Purchase of noncontrolling interest, value		195,000			(817,000)	(622,000)	(788,000)
Sale of noncontrolling interest, value		(1,702,000)			439,000	(1,263,000)	1,771,000
Acquisitions and other transactions impacting noncontrolling interests					122,276,000	122,276,000	21,390,000
Disposals and other transactions impacting noncontrolling interests		(511,000)			(3,154,000)	(3,665,000)	566,000
Gain on interest rate swap, net of income tax expense				515,000		515,000
Balance at Dec. 31, 2011		173,187,000	443,058,000	0	132,222,000	748,467,000	170,636,000
Balance (in shares) at Dec. 31, 2011		31,284,000
Issuance of restricted common stock (in shares)		281,000
Cancellation of restricted common stock		0				0
Cancellation of restricted common stock (in shares)		(2,000)
Stock options exercised		18,214,000				18,214,000
Stock options exercised (in shares)	841,599	842,000
Stock repurchased		(13,101,000)				(13,101,000)
Stock repurchased (in shares)		(464,000)
Share-based compensation, value	6,692,000	6,692,000				6,692,000
Tax benefit related to exercise of stock options		1,834,000				1,834,000
Net earnings	223,643,000		62,563,000		26,303,000	88,866,000	134,777,000
Distributions to noncontrolling interests, net of capital contributions					(26,514,000)	(26,514,000)	(136,356,000)
Purchase of noncontrolling interest, value		252,000			(421,000)	(169,000)	(81,000)
Sale of noncontrolling interest, value		(2,794,000)			4,352,000	1,558,000	0
Acquisitions and other transactions impacting noncontrolling interests					175,036,000	175,036,000	7,038,000
Disposals and other transactions impacting noncontrolling interests		(417,000)			0	(417,000)	(632,000)
Balance at Dec. 31, 2012	1,000,466,000	183,867,000	505,621,000	0	310,978,000	1,000,466,000	175,382,000
Balance (in shares) at Dec. 31, 2012		31,941,000
Issuance of restricted common stock (in shares)		292,000
Cancellation of restricted common stock (in shares)		(16,000)
Stock options exercised		33,349,000				33,349,000
Stock options exercised (in shares)	1,392,366	1,393,000
Stock repurchased		(45,964,000)				(45,964,000)
Stock repurchased (in shares)		(1,257,000)
Share-based compensation, value	8,321,000	8,321,000				8,321,000
Tax benefit related to exercise of stock options		7,247,000				7,247,000
Net earnings	261,544,000		72,703,000		49,789,000	122,492,000	139,052,000
Distributions to noncontrolling interests, net of capital contributions					(49,533,000)	(49,533,000)	(134,298,000)
Purchase of noncontrolling interest, value		679,000			(1,926,000)	(1,247,000)	(319,000)
Sale of noncontrolling interest, value		(1,626,000)			2,327,000	701,000	852,000
Acquisitions and other transactions impacting noncontrolling interests					50,041,000	50,041,000	0
Disposals and other transactions impacting noncontrolling interests		0			(317,000)	(317,000)	(2,972,000)
Balance at Dec. 31, 2013	$ 1,125,556,000	$ 185,873,000	$ 578,324,000	$ 0	$ 361,359,000	$ 1,125,556,000	$ 177,697,000
Balance (in shares) at Dec. 31, 2013		32,353,000