Fair Value Measurement - Summary of Activity for Account Balances Whose Fair Value Measurements are Estimated Utilizing Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Redeemable Noncontrolling Interests [Roll Forward]
Additions to non-controlling interests	$ 700
Fair value adjustments	(17,794)	$ 18,865	$ 7,933
Redeemable Noncontrolling Interests (Temporary Equity) [Member]
Redeemable Noncontrolling Interests [Roll Forward]
Beginning period balance	96,251	133,000
Dividends paid to non-controlling interests	(12,985)	(27,563)
Net (loss) income	(2,760)	9,679
Additions to non-controlling interests	700
Fair value adjustments	17,794	(18,865)	(7,933)
Ending period balance	$ 99,000	$ 96,251	$ 133,000