Acquisitions (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2012	Aug. 15, 2014	Feb. 01, 2012
Consideration:
Cash, net of cash acquired	$ 138,490	$ 52,688	$ 134,916
Assumed debt	7,426	2,360	0
Earn-out contingent consideration	3,200	2,200
Goodwill		114,935	45,665
Noncontrolling interest	(933)	(3,336)
Fair value of pre-existing investment	2,014	0	11,850
Acquisitions, excluding AVC [Member]
Consideration:
Cash, net of cash acquired	122,803	52,688	78,629
Holdbacks	3,000	1,092	2,425
Earn-out contingent consideration	2,037	1,285	1,306
Fair value of total consideration transferred	135,266	57,425	82,360
Tangible assets	5,902	14,779	3,515
Identifiable intangible assets(1)	22,964	15,001	14,718
Goodwill	110,234	45,665	64,253
Notes payable and other liabilities assumed	(115)	(11,084)	(126)
Recognized identifiable assets acquired, goodwill, and liabilities assumed, net	138,985	64,361	82,360
Noncontrolling interest	(1,705)	(6,936)	0
Fair value of pre-existing investment	(2,014)	0	0
AVC [Member]
Consideration:
Cash, net of cash acquired				48,819
Assumed debt				25,915
Fair value of total consideration transferred				74,734
Tangible assets				11,694
Identifiable intangible assets(1)				25,170
Goodwill				79,707
Notes payable and other liabilities assumed				(21,826)
Purchase price allocation, total				94,745
Recognized identifiable assets acquired, goodwill, and liabilities assumed, net				74,734
Noncontrolling interest				(8,161)
Fair value of pre-existing investment				(11,850)
D.O.G. Enterprises, LLC [Member]
Consideration:
Cash, net of cash acquired					15,174
Assumed debt					323
Holdbacks					1,500
Earn-out contingent consideration					760
Fair value of total consideration transferred					17,757
Tangible assets					637
Identifiable intangible assets(1)					13,420
Goodwill					4,219
Notes payable and other liabilities assumed					(519)
Recognized identifiable assets acquired, goodwill, and liabilities assumed, net					17,757
Think Pets Inc [Member]
Consideration:
Cash, net of cash acquired						7,468
Holdbacks						1,050
Fair value of total consideration transferred						19,018
Tangible assets						2,093
Identifiable intangible assets(1)						7,221
Goodwill						12,155
Notes payable and other liabilities assumed						(2,451)
Recognized identifiable assets acquired, goodwill, and liabilities assumed, net						$ 19,018