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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Additional Information (Detail) (USD $) |  |  | 0 Months Ended | 1 Months Ended |  | 6 Months Ended |
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Jun. 30, 2014 | Dec. 31, 2013 | Apr. 24, 2014 Olney Center | Apr. 30, 2014 Olney Center | Jun. 30, 2014 Van Ness Square | Jun. 30, 2014 Northrock Loan | Jun. 30, 2014 Variable Rate Loans Payable Northrock Loan | Jun. 30, 2014 Variable Rate Loans Payable Metro Pike Center Bank Loan | Jun. 30, 2014 Fixed Rate Mortgage Notes Payable Metro Pike Center | Jun. 30, 2014 Fixed Rate Mortgage Notes Payable Metro Pike Center Bank Loan | Jun. 30, 2014 Unsecured Revolving Credit Facility | Jun. 30, 2014 Unsecured Revolving Credit Facility LIBOR | Jun. 30, 2014 Unsecured Revolving Credit Facility LIBOR Minimum | Jun. 30, 2014 Unsecured Revolving Credit Facility LIBOR Maximum | Jun. 30, 2014 Letter of Credit
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable | $ 820,145,000 | $ 820,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding with fixed-rate | 790,200,000 | 789,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding with variable-rate | 29,900,000 | 30,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of properties collateralizing mortgage notes | 901,000,000 | 907,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 275,000,000 |  |  |  | 628,000
Line of credit facility maturity date |  |  |  |  |  |  |  |  |  |  | Jun. 23, 2018 |  |  |  |
Extension in line of credit facility period |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 274,400,000 |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  | one-month LIBOR |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  |  |  |  |  | 1.45% | 1.45% | 2.00% |
Guarantor obligations, maximum exposure, percentage |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Construction-to-permanent loan |  |  |  |  | 71,600,000 |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  | 7,500,000 |  |  |  | 7,800,000 |  |  |  |  |
Amount oustanding |  |  |  |  |  |  | 14,662,000 | 15,248,000 |  |  |  |  |  |  |
Total outstanding debt |  | 820,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  | 11,000,000 | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale-leaseback, monthly lease payments |  |  | 60,400 |  |  |  |  |  |  |  |  |  |  |  |
Annual increase in rental payments, percentage |  |  | 1.50% | 1.50% |  |  |  |  |  |  |  |  |  |  |
Sale-leaseback, fixed interest rate |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Sales price of property |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale leaseback, option to purchase the property |  |  | $ 14,600,000 | $ 14,600,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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