Acquisition - Summary of Preliminary Estimated Fair Value of Intangible Assets Acquired and the Related Estimated Useful Lives (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Aug. 31, 2016
STP
Business Acquisition [Line Items]
Other intangible assets	$ 642,012		$ 642,012
STP | Customer relationships and other identifiable intangible assets
Business Acquisition [Line Items]
Other intangible assets	$ 642,012
STP | Customer relationships and other identifiable intangible assets | Minimum
Business Acquisition [Line Items]
Useful Lives	4 years
STP | Customer relationships and other identifiable intangible assets | Maximum
Business Acquisition [Line Items]
Useful Lives	10 years
Other
Business Acquisition [Line Items]
Other intangible assets	$ 63,410
Other | Customer relationships and other identifiable intangible assets
Business Acquisition [Line Items]
Other intangible assets	$ 63,410
Other | Customer relationships and other identifiable intangible assets | Minimum
Business Acquisition [Line Items]
Useful Lives	10 years
Other | Customer relationships and other identifiable intangible assets | Maximum
Business Acquisition [Line Items]
Useful Lives	20 years
2015 Acquisitions
Business Acquisition [Line Items]
Other intangible assets		$ 39,791
2015 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Other intangible assets		$ 39,791
2015 Acquisitions | Customer relationships | Minimum
Business Acquisition [Line Items]
Useful Lives		14 years
2015 Acquisitions | Customer relationships | Maximum
Business Acquisition [Line Items]
Useful Lives		20 years