Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Other Commitments [Line Items]
Letters of credit outstanding, amount	$ 6.4		$ 6.2
Capital Lease Obligations	$ 19.9		$ 23.0
Lease obligation interest rates	4.03%
Non Cancellable Operating Leases Arrangements
Other Commitments [Line Items]
Operating lease expenses	$ 3.1	$ 2.7
Deferred rent liabilities	$ 2.9	$ 2.9
Maximum | Capital Lease Obligations
Other Commitments [Line Items]
Lease obligation interest rates	10.00%
Letter of Credit
Other Commitments [Line Items]
Letter of credit, fee percentage			2.50%
Letter of Credit | Minimum
Other Commitments [Line Items]
Letter of credit, fee percentage	2.50%
Letter of Credit | Maximum
Other Commitments [Line Items]
Letter of credit, fee percentage	3.00%