Borrowings - Long-Term Borrowings (Details) $ in Thousands, ¥ in Billions			3 Months Ended
	Oct. 27, 2016 USD ($)	Apr. 15, 2015 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2016	Jul. 25, 2016 JPY (¥)	Jul. 25, 2016 USD ($)	Jul. 18, 2016 USD ($)
Long-Term Borrowings
Discount						$ 915	$ 956
Percentage of the non-voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries collateralized	100.00%
Percentage of the voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries as collateral	65.00%
Outstanding principal amount						570,071
Interest expense			$ 6,828	$ 7,101
Deferred financing fees						3,839	4,012
Reconciliation of senior secured credit facility
Outstanding principal						570,071
Net deferred financing fees						(3,839)	(4,012)
Discount						(915)	(956)
Long term borrowings						565,317	564,957
Aggregate future required minimum principal payments based on the terms of loan
2017						4,050
2018						5,400
2019						5,400
2020 and thereafter						555,221
Total principal of long-term borrowings						570,071
Senior Secured Credit Facility
Long-Term Borrowings
Face amount	$ 540,000
Discount (as a percent)	0.25%
Outstanding principal amount						538,650	540,000
Maximum borrowing capacity	$ 100,000
Reconciliation of senior secured credit facility
Outstanding principal						538,650	540,000
Long term borrowings						533,961	535,104
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings						538,650	540,000
Senior Secured Credit Facility | First option
Long-Term Borrowings
Fixed interest rate base (as a percent)	1.75%
Senior Secured Credit Facility | Second option
Long-Term Borrowings
Fixed interest rate base (as a percent)	0.75%
Additional interest margin added to fixed and variable rates (as a percent)	3.50%
Senior Secured Credit Facility | Prime rate
Long-Term Borrowings
Additional interest margin added to fixed and variable rates (as a percent)	2.50%
Senior Secured Credit Facility | Federal funds effective rate
Long-Term Borrowings
Interest rate added to variable rate (as a percent)	0.50%
Additional interest margin added to fixed and variable rates (as a percent)			2.50%
Senior Secured Credit Facility | Eurodollar
Long-Term Borrowings
Interest rate added to variable rate (as a percent)	1.00%	1.00%
Interest period	1 year	1 month
Revolving credit facility
Long-Term Borrowings
Maximum borrowing capacity		$ 100,000
Commitment fee (as a percent)		0.50%
Revolving credit facility | First option
Long-Term Borrowings
Fixed interest rate base (as a percent)		2.00%
Additional interest margin added to fixed and variable rates (as a percent)		2.00%
Revolving credit facility | Second option
Long-Term Borrowings
Fixed interest rate base (as a percent)		1.00%
Additional interest margin added to fixed and variable rates (as a percent)		3.00%
Revolving credit facility | Federal funds effective rate
Long-Term Borrowings
Interest rate added to variable rate (as a percent)		0.50%
Additional interest margin added to fixed and variable rates (as a percent)			3.00%
Broker-Dealer Credit Facility on committed basis
Long-Term Borrowings
Maximum borrowing capacity											$ 75,000
SBI Bonds
Long-Term Borrowings
Outstanding principal amount						31,421	29,925
Reconciliation of senior secured credit facility
Outstanding principal						31,421	29,925
Long term borrowings						31,356	29,853
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings						31,421	$ 29,925
VFH Parent LLC | SBI Bonds
Long-Term Borrowings
Face amount									¥ 3.5	$ 33,100
Interest rate (as a percent)								5.00%	4.00%	4.00%
Loss due to change in currency rates			$ (1,500)
Outstanding principal amount					¥ 3.5	31,400
Reconciliation of senior secured credit facility
Outstanding principal					3.5	31,400
Aggregate future required minimum principal payments based on the terms of loan
Total principal of long-term borrowings					¥ 3.5	$ 31,400