Amounts Incurred for Management Fee and Reimbursable Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions [Abstract]
Management fee	$ 4,112	$ 4,122	$ 4,144	$ 4,154	$ 4,224	$ 4,522	$ 4,714	$ 4,720	$ 16,532	$ 18,180	$ 17,420
Reimbursable Expenses									4,239us-gaap_CostOfReimbursableExpense	3,200us-gaap_CostOfReimbursableExpense	1,779us-gaap_CostOfReimbursableExpense
Total									20,771hts_RelatedPartyTransactionExpenses	21,380hts_RelatedPartyTransactionExpenses	19,199hts_RelatedPartyTransactionExpenses
Share-based compensation	$ 1,020us-gaap_ShareBasedCompensation	$ 890us-gaap_ShareBasedCompensation	$ 842us-gaap_ShareBasedCompensation	$ 860us-gaap_ShareBasedCompensation	$ 701us-gaap_ShareBasedCompensation	$ 637us-gaap_ShareBasedCompensation	$ 627us-gaap_ShareBasedCompensation	$ 629us-gaap_ShareBasedCompensation	$ 3,612us-gaap_ShareBasedCompensation	$ 2,594us-gaap_ShareBasedCompensation	$ 1,920us-gaap_ShareBasedCompensation

Related party transaction expenses.

No definition available.

Name:	hts_RelatedPartyTransactionExpenses
Namespace Prefix:	hts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_CostOfReimbursableExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration