Related-Party Transactions (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) director shares	Dec. 31, 2016 USD ($) agreement	Dec. 31, 2015 USD ($) agreement	Jul. 13, 2017 USD ($)
Related-Party Transactions
Rental expense for operating leases									$ 60,300	$ 36,700	$ 30,700
Revenue share percentage										75.00%	75.00%
Related party expense	$ 1,698	$ 26,892	$ 2,456	$ 2,385	$ 3,121	$ 2,448	$ 2,589	$ 2,335	33,431	$ 10,493	$ 8,977
Revenue	386,289	$ 338,393	$ 209,382	$ 218,260	212,399	$ 186,373	$ 191,464	$ 199,690	1,152,324	789,926	805,232
Receivable and Payable Balances with Affiliates
Payable balances with affiliates	14,445				9,344				14,445	9,344
HOV RE, LLC
Related-Party Transactions
Rental expense for operating leases									700	600	200
Oakana Holdings, Inc.
Related-Party Transactions
Consulting agreement expenses										0	0
HGM
Related-Party Transactions
Management fees									6,000	6,000	6,000
Management fee payable												$ 0
Reimbursable travel expenses									900	$ 1,700	$ 800
Number of master agreements | agreement										10	10
Revenue share percentage										25.00%	25.00%
Contract cancellation and advising fees									23,000
Contract cancellation and advising fees in the form of contributed capital									$ 10,000
Common Stock, shares issued for contract cancellation and advising fees (in shares) | shares									1,250,000
Receivable and Payable Balances with Affiliates
Payable balances with affiliates	13,689				8,858				$ 13,689	$ 8,858
Rule 14
Related-Party Transactions
Marketing fees									600	500	$ 0
Receivable and Payable Balances with Affiliates
Payable balances with affiliates	158				134				158	134
HOV Services, Ltd
Receivable and Payable Balances with Affiliates
Payable balances with affiliates	286				$ 352				286	352
HOV Services, Ltd | Cost of revenue
Related-Party Transactions
Expense recognized									$ 1,700	1,700	1,400
Apollo
Related-Party Transactions
Number of Company directors that can be designated by the related party | director									2
Related party expense									$ 300	0	0
Management Holdings
Related-Party Transactions
Revenue									300	0	0
Caesars
Related-Party Transactions
Revenue										0	0
ADT LLC | Maximum
Related-Party Transactions
Revenue									100
Presidio
Receivable and Payable Balances with Affiliates
Payable balances with affiliates	$ 312								312
Family relationship between certain stockholders and President of Oakana Holdings
Related-Party Transactions
Consulting agreement expenses									100
Executive Vice President Treasury and Business Affairs
Related-Party Transactions
Consulting agreement expenses									$ 500	$ 500	$ 200