Income Taxes - Summary of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Gross unrecognized tax benefits at beginning of period	$ 12,448	$ 12,372	$ 4,504
Increases in tax positions for prior years	1,716	2,614	5,294
Decreases in tax positions for prior years	(270)	(3,156)
Increases in tax positions for current year relating to ongoing operations	6,205	618	2,574
Increases in tax positions for current year relating to acquisitions	3,223
Gross unrecognized tax benefits period end	$ 23,322	$ 12,448	$ 12,372