Borrowings - Long-Term Borrowings (Details) $ in Thousands, ¥ in Billions		3 Months Ended		9 Months Ended
	Jun. 16, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 JPY (¥)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Oct. 31, 2016	Jul. 25, 2016 JPY (¥)	Jul. 25, 2016 USD ($)
Long-Term Borrowings
Loss due to change in currency rates		$ 1	$ 1,500
Repayments of long-term debt				$ 206,473	$ 3,825
Discount							$ 1,242		$ 956
Debt Issue Cost Related To Debt Refinancing		4,869		9,351
Outstanding principal amount							1,481,108
Interest expense		24,593	$ 7,393	$ 40,141	21,569
Deferred financing fees							45,237		4,012
Reconciliation of senior secured credit facility
Outstanding principal							1,481,108
Net deferred financing fees							(45,237)		(4,012)
Discount							(1,242)		(956)
Long term borrowings							1,434,629		564,957
Aggregate future required minimum principal payments based on the terms of loan
2020 and thereafter							1,481,108
Total principal of long-term borrowings							1,481,108
Prior to June 15, 2019 scenario two
Long-Term Borrowings
Redemption price as a percentage of the principal amount				106.75%
Prior to June 15, 2019 scenario two | Maximum
Long-Term Borrowings
Percentage of principal amount that may be redeemed				35.00%
Change of control events
Long-Term Borrowings
Percentage of principal amount that may be redeemed				101.00%
12-month period beginning June 15, 2019
Long-Term Borrowings
Redemption price as a percentage of the principal amount				103.375%
12-month period beginning June 15, 2020
Long-Term Borrowings
Redemption price as a percentage of the principal amount				101.688%
12-month periods beginning June 15, 2021 and thereafter
Long-Term Borrowings
Redemption price as a percentage of the principal amount				100.00%
Term Loan
Long-Term Borrowings
Outstanding principal balance							950,000
Broker-Dealer Credit Facility on committed basis
Long-Term Borrowings
Maximum borrowing capacity							75,000
Senior Secured Second Lien Notes
Long-Term Borrowings
Face amount	$ 500,000
Interest rate (as a percent)	6.75%
Percentage of the voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries as collateral				65.00%
Redemption price as a percentage of the principal amount				100.00%
Spread above US treasury securities yield as a make whole premium				0.50%
Outstanding principal amount							500,000
Interest period	6 months
Reconciliation of senior secured credit facility
Outstanding principal							500,000
Long term borrowings							475,485
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings							500,000
Escrow Credit Facility
Long-Term Borrowings
Face amount								$ 610,000
Annual amortization obligation as a percentage of original principal amount								7.50%
Senior Secured Credit Facility
Long-Term Borrowings
Face amount								$ 540,000
Outstanding principal amount							950,000		540,000
Reconciliation of senior secured credit facility
Outstanding principal							950,000		540,000
Long term borrowings							928,089		535,104
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings							950,000		540,000
Senior Secured Credit Facility Fourth Amendment
Long-Term Borrowings
Repayments of long-term debt		200,000
Number of anniversaries of closing of the acquisition | item								4
Annual amortization obligation as a percentage of original principal amount								7.50%
Outstanding principal amount							950,000	$ 1,150,000
Reconciliation of senior secured credit facility
Outstanding principal							950,000	1,150,000
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings							950,000	1,150,000
Amortization expense related to the deferred financing fees		$ 4,900		$ 9,400
Senior Secured Credit Facility Fourth Amendment | Maximum
Long-Term Borrowings
Leverage ratio				5.00%
interest coverage ratio				3.00%
Senior Secured Credit Facility Fourth Amendment | Minimum
Long-Term Borrowings
interest coverage ratio				2.75%
Senior Secured Credit Facility Fourth Amendment | From and after the fiscal quarter ending March 31, 2019
Long-Term Borrowings
Leverage ratio				4.25%
Senior Secured Credit Facility Fourth Amendment | From and after the fiscal quarter ending March 31, 2020
Long-Term Borrowings
Leverage ratio				3.50%
Senior Secured Credit Facility Fourth Amendment | From the fiscal quarter ending March 31,2021 and thereafter
Long-Term Borrowings
Leverage ratio				3.25%
SBI Bonds
Long-Term Borrowings
Loss due to change in currency rates				$ 50	$ 1,500
Outstanding principal amount							31,108		29,925
Reconciliation of senior secured credit facility
Outstanding principal							31,108		29,925
Long term borrowings							31,055		29,853
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings							$ 31,108		$ 29,925
VFH
Long-Term Borrowings
Percentage of the non-voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries collateralized				100.00%
VFH | Maximum
Long-Term Borrowings
Percentage of the voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries as collateral				65.00%
VFH | Senior Secured Credit Facility
Long-Term Borrowings
Face amount								$ 100,000
VFH | Senior Secured Credit Facility Fourth Amendment | Term Loan | Prime rate
Long-Term Borrowings
Interest rate (as a percent)						2.75%	2.75%
Interest rate added to variable rate (as a percent)				2.00%
VFH | Senior Secured Credit Facility Fourth Amendment | Term Loan | Federal funds effective rate
Long-Term Borrowings
Interest rate added to variable rate (as a percent)				0.50%
VFH | Senior Secured Credit Facility Fourth Amendment | Term Loan | Eurodollar
Long-Term Borrowings
Interest rate added to variable rate (as a percent)				1.00%
VFH | Senior Secured Credit Facility Fourth Amendment | Term Loan | LIBOR rate
Long-Term Borrowings
Interest rate (as a percent)						3.75%	3.75%
Interest rate added to variable rate (as a percent)				1.00%
VFH | Senior Secured Credit Facility Fourth Amendment | Revolving credit facility | Prime rate
Long-Term Borrowings
Interest rate (as a percent)						2.00%	2.00%
Interest rate added to variable rate (as a percent)				1.00%
VFH | Senior Secured Credit Facility Fourth Amendment | Revolving credit facility | Federal funds effective rate
Long-Term Borrowings
Interest rate added to variable rate (as a percent)				0.50%
VFH | Senior Secured Credit Facility Fourth Amendment | Revolving credit facility | Eurodollar
Long-Term Borrowings
Interest rate added to variable rate (as a percent)				1.00%
VFH | Senior Secured Credit Facility Fourth Amendment | Revolving credit facility | LIBOR rate
Long-Term Borrowings
Interest rate (as a percent)						3.00%	3.00%
Interest rate added to variable rate (as a percent)				0.00%
VFH | SBI Bonds
Long-Term Borrowings
Face amount						¥ 3.5	$ (31,100)				¥ 3.5	$ 31,100
Interest rate (as a percent)										5.00%	4.00%	4.00%