Business and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands			6 Months Ended
	Feb. 24, 2017 shares	Feb. 15, 2017 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) employee location $ / shares	Jun. 30, 2016 USD ($)	Dec. 31, 2016 $ / shares
Class of Stock [Line Items]
Proceeds from issuance of stock | $		$ 164,000
Repayments of debt | $			$ 0	$ 1,400
Common stock par value (in dollars per share) | $ / shares		$ 13,000	$ 0.001		$ 0.001
IPO
Class of Stock [Line Items]
Options exercised by underwriters to purchase additional shares (in shares) | shares		12,800,000
Public offering price of stock (in dollars per share) | $ / shares		$ 14.00
Parent 2 | Over-Allotment Option
Class of Stock [Line Items]
Options exercised by underwriters to purchase additional shares (in shares) | shares	1,920,000
U.S. and Canada
Class of Stock [Line Items]
Number of employees (more than) | employee			3,500
Number of branch locations (more than) | location			220