First Industrial 10-Q 31 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014
Entity Information [Line Items]	'
Entity Registrant Name	'FIRST INDUSTRIAL LP
Entity Central Index Key	'0001033128
Trading Symbol	'FRFI
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Accelerated Filer
Document Type	'10-Q
Document Period End Date	30-Sep-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q3
Entity Current Reporting Status	'Yes
Amendment Flag	'false
Entity Common Stock, Shares Outstanding	0

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment in Real Estate:	'	'
Land	$611,228	$610,802
Buildings and Improvements	2,130,891	2,113,689
Construction in Progress	38,066	23,688
Less: Accumulated Depreciation	-685,678	-652,971
Net Investment in Real Estate	2,094,507	2,095,208
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Other Amortization of $2,258 and $0	15,413	0
Investments in and Advances to Other Real Estate Partnerships	201,935	196,323
Cash and Cash Equivalents	13,026	6,518
Tenant Accounts Receivable, Net	5,057	4,746
Investments in Joint Venture	84	907
Deferred Rent Receivable, Net	49,368	49,173
Deferred Financing Costs, Net	10,584	10,570
Deferred Leasing Intangibles, Net	27,841	26,581
Prepaid Expenses and Other Assets, Net	76,340	108,753
Total Assets	2,494,155	2,498,779
Indebtedness:	'	'
Mortgage Loans Payable, Net	521,304	580,215
Senior Unsecured Notes, Net	364,837	445,916
Unsecured Term Loan	200,000	0
Unsecured Credit Facility	176,000	173,000
Accounts Payable, Accrued Expenses and Other Liabilities	77,184	70,139
Deferred Leasing Intangibles, Net	11,266	11,879
Rents Received in Advance and Security Deposits	29,083	26,619
Distributions Payable	11,886	10,289
Total Liabilities	1,391,560	1,318,057
Commitments and Contingencies	0	0
Partners’ Capital:	'	'
General Partner Preferred Units (See Note 6)	0	73,587
General Partner Units (110,553,523 and 109,980,850 units outstanding)	1,024,806	1,027,664
Limited Partners Units (4,421,980 and 4,597,313 units outstanding)	80,905	82,833
Accumulated Other Comprehensive Loss	-3,116	-3,362
Total Partners’ Capital	1,102,595	1,180,722
Total Liabilities and Partners’ Capital	$2,494,155	$2,498,779

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Real Estate and Other Assets Held For Sale Accumulated Depreciation And Other Amortization	$2,258	$0
General Partner Units, Outstanding	110,553,523	109,980,850
Limited Partners Units, Outstanding	4,421,980	4,597,313

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:	'	'	'	'
Rental Income	$58,667	$54,516	$169,496	$161,348
Tenant Recoveries and Other Income	18,259	15,498	56,414	48,736
Total Revenues	76,926	70,014	225,910	210,084
Expenses:	'	'	'	'
Property Expenses	24,646	22,499	76,077	68,820
General and Administrative	5,345	5,131	17,946	16,975
Impairment of Real Estate	0	1,047	0	1,047	[1]
Depreciation and Other Amortization	25,029	24,119	75,237	71,086
Total Expenses	55,020	52,796	169,260	157,928
Other Income (Expense):	'	'	'	'
Interest Income	700	611	2,114	1,818
Interest Expense	-16,178	-16,918	-51,522	-51,850
Amortization of Deferred Financing Costs	-716	-736	-2,235	-2,326
Mark-to-Market Gain on Interest Rate Protection Agreements	0	0	0	52
Loss from Retirement of Debt	-29	-662	-522	-6,034
Total Other Income (Expense)	-16,223	-17,705	-52,165	-58,340
Income (Loss) from Continuing Operations Before Equity in Income of Other Real Estate Partnerships, Equity in (Loss) Income of Joint Ventures and Income Tax Provision	5,683	-487	4,485	-6,184
Equity in Income of Other Real Estate Partnerships	4,775	4,546	10,385	9,117
Equity in (Loss) Income of Joint Ventures	-14	72	3,508	119
Income Tax Provision	-103	-63	-192	-4
Income from Continuing Operations	10,341	4,068	18,186	3,048
Discontinued Operations:	'	'	'	'
Income Attributable to Discontinued Operations	300	836	1,046	1,452
Gain on Sale of Real Estate	11,577	3,613	12,291	14,020
Income from Discontinued Operations	11,877	4,449	13,337	15,472
Income Before Gain on Sale of Real Estate	22,218	8,517	31,523	18,520
Gain on Sale of Real Estate	0	221	0	483
Net Income	22,218	8,738	31,523	19,003
Less: Preferred Unit Distributions	0	-1,392	-1,019	-7,506
Less: Redemption of Preferred Units	0	-2,121	-1,462	-5,667
Net Income Available to Unitholders and Participating Securities	22,218	5,225	29,042	5,830
Basic and Diluted Earnings Per Unit:	'	'	'	'
Income (Loss) from Continuing Operations Available to Unitholders	$0.09	$0	$0.14	($0.09)
Income from Discontinued Operations Attributable to Unitholders	$0.10	$0.04	$0.11	$0.14
Net Income Available to Unitholders	$0.19	$0.04	$0.25	$0.05
Distributions Per Unit	$0.10	$0.09	$0.31	$0.26
Weighted Average Units Outstanding - Basic	114,512	114,089	114,346	110,823
Weighted Average Units Outstanding - Diluted	114,711	114,404	114,788	110,823
Net Income Available to Unitholders Attributable to:	'	'	'	'
General Partner	21,350	5,006	27,905	5,586
Limited Partners	868	219	1,137	244
Net Income Available to Unitholders and Participating Securities	$22,218	$5,225	$29,042	$5,830
[1]	Excludes industrial properties for which impairment of $1,605 was recorded during the nine months ended September 30, 2013 since the related assets were sold or recorded at carrying value, which is lower than estimated fair value at September 30, 2013.

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income	$22,218	$8,738	$31,523	$19,003
Mark-to-Market Gain (Loss) on Interest Rate Protection Agreements	3,592	0	-905	0
Amortization of Interest Rate Protection Agreements	131	609	1,227	1,792
Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements	0	17	0	1,116
Foreign Currency Translation Adjustment	-71	30	-76	-14
Comprehensive Income	$25,870	$9,394	$31,769	$21,897

CONSOLIDATED_STATEMENT_OF_CHAN

CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS CAPITAL (USD $)	Total	General Partner Preferred Units	General Partner Units	Limited Partner Units	Accumulated Other Comprehensive Loss
In Thousands, unless otherwise specified
Balance at Dec. 31, 2013	$1,180,722	$73,587	$1,027,664	$82,833	($3,362)
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'	'
Redemption of Preferred Units	-73,587	-73,587	'	'	'
Stock Based Compensation Activity	1,588	'	1,588	'	'
Conversion of Limited Partner Units to General Partner Units	0	'	1,697	-1,697	'
Common Unit Distributions	-35,416	'	-34,048	-1,368	'
Preferred Unit Distributions	-2,481	-2,481	'	'	'
Net Income	31,523	2,481	27,905	1,137	'
Other Comprehensive Income	246	'	'	'	246
Balance at Sep. 30, 2014	$1,102,595	$0	$1,024,806	$80,905	($3,116)

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net Income	$31,523	$19,003
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:	'	'
Depreciation	62,421	62,643
Amortization of Deferred Financing Costs	2,235	2,326
Other Amortization	22,220	21,241
Impairment of Real Estate	0	2,652
Provision for Bad Debt	1,038	656
Equity in Income of Joint Ventures	-3,508	-119
Distributions from Joint Ventures	1,881	0
Gain on Sale of Real Estate	-12,291	-14,503
Loss from Retirement of Debt	522	6,034
Mark-to-Market Gain on Interest Rate Protection Agreements	0	-52
Equity in Income of Other Real Estate Partnerships	-10,385	-9,117
Distributions from Investment in Other Real Estate Partnerships	10,385	9,117
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	-8,421	-3,764
Increase in Deferred Rent Receivable	-816	-2,963
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	-3,756	-9,391
Payments of Premiums, Discounts and Prepayment Penalties Associated with Retirement of Debt	-10,553	-4,513
Net Cash Provided by Operating Activities	82,495	79,250
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Acquisitions of Real Estate	-43,362	-47,293
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	-73,701	-65,591
Net Proceeds from Sales of Investments in Real Estate	48,537	62,084
Investments in and Advances to Other Real Estate Partnerships	-25,113	-40,355
Distributions from Other Real Estate Partnerships in Excess of Equity in Income	19,501	22,183
Contributions to and Investments in Joint Ventures	-28	-26
Distributions from Joint Ventures	2,469	0
Repayments of Notes Receivable	49,761	454
Increase in Escrows	-770	-189
Net Cash Used in Investing Activities	-22,706	-68,733
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Debt and Equity Issuance and Redemption Costs	-2,411	-3,567
Unit Contributions	0	174,081
Repurchase and Retirement of Restricted Units	-4,667	-2,968
Common Unit Distributions Paid	-33,367	-19,286
Preferred Unit Distributions Paid	-1,471	-7,958
Redemption of Preferred Units	-75,000	-150,000
Payments on Interest Rate Protection Agreements	0	-865
Repayments on Mortgage Loans Payable	-67,764	-41,389
Repayments of Senior Unsecured Notes	-71,578	-29,769
Proceeds from Unsecured Term Loan	200,000	0
Proceeds from Unsecured Credit Facility	307,000	289,000
Repayments on Unsecured Credit Facility	-304,000	-216,000
Net Cash Used in Financing Activities	-53,258	-8,721
Net Effect of Exchange Rate Changes on Cash and Cash Equivalents	-23	-20
Net Increase in Cash and Cash Equivalents	6,531	1,796
Cash and Cash Equivalents, Beginning of Year	6,518	4,357
Cash and Cash Equivalents, End of Year	$13,026	$6,133

Organization_and_Formation_of_

Organization and Formation of Partnership	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization and Formation of Partnership	'
	1. Organization and Formation of Partnership
	First Industrial, L.P. (the "Operating Partnership") was organized as a limited partnership in the state of Delaware on November 23, 1993. The sole general partner is First Industrial Realty Trust, Inc. (the "Company") which owns common units in the Operating Partnership ("Units") representing an approximate 96.2% ownership interest at September 30, 2014. The Company is a real estate investment trust ("REIT") as defined in the Internal Revenue Code of 1986. The Company’s operations are conducted primarily through the Operating Partnership. The limited partners of the Operating Partnership owned, in the aggregate, approximately a 3.8% interest in the Operating Partnership at September 30, 2014. Operations are also conducted through other partnerships and limited liability companies ("LLCs") of which the Operating Partnership is the sole member, and taxable REIT subsidiaries (together with the Operating Partnership, other partnerships and the LLCs, the "Consolidated Operating Partnership"), the operating data of which is consolidated with that of the Operating Partnership as presented herein. Unless the context otherwise requires, the terms "we," "us" and "our" refer to First Industrial, L.P. and its controlled subsidiaries.
	We also hold at least a 99% limited partnership interest in each of eight limited partnerships (together, the "Other Real Estate Partnerships"). The Other Real Estate Partnerships’ operating data is presented herein on a combined basis, separate from that of the Consolidated Operating Partnership. The general partners of the Other Real Estate Partnerships are separate corporations, each with at least a .01% general partnership interest in the Other Real Estate Partnership for which it acts as a general partner. Each general partner of the Other Real Estate Partnerships is a wholly-owned subsidiary of the Company.
	Profits, losses and distributions of us, the LLCs and Other Real Estate Partnerships are allocated to the general partner and the limited partners or the members, as applicable, in accordance with the provisions contained within the partnership agreements, operating agreements or other ownership agreements, as applicable.
	We also own noncontrolling equity interests in, and provide various services to, two joint ventures (the "2003 Net Lease Joint Venture" and the "2007 Europe Joint Venture"; collectively, the "Joint Ventures"). At September 30, 2014, the 2003 Net Lease Joint Venture owned one industrial property comprising approximately 0.8 million square feet of gross leasable area ("GLA") and the 2007 Europe Joint Venture did not own any properties.
	The Other Real Estate Partnerships and the Joint Ventures are accounted for under the equity method of accounting. Accordingly, the operating data of the Other Real Estate Partnerships and the Joint Ventures are not consolidated with that of the Consolidated Operating Partnership as presented herein.
	As of September 30, 2014, we owned 576 industrial properties located in 24 states, containing an aggregate of approximately 55.4 million square feet of GLA. On a combined basis, as of September 30, 2014, the Other Real Estate Partnerships owned 62 industrial properties containing an aggregate of approximately 7.9 million square feet of GLA.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	2. Summary of Significant Accounting Policies
	The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the accounting policies described in the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2013 ("2013 Form 10-K") and should be read in conjunction with such consolidated financial statements and related notes. The 2013 year end consolidated balance sheet data included in this Form 10-Q filing was derived from the audited consolidated financial statements in our 2013 Form 10-K, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("GAAP"). The following notes to these interim consolidated financial statements highlight significant changes to the notes included in the December 31, 2013 audited consolidated financial statements included in our 2013 Form 10-K and present interim disclosures as required by the Securities and Exchange Commission. In order to conform with GAAP, in preparation of our consolidated financial statements we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of September 30, 2014 and December 31, 2013, and the reported amounts of revenues and expenses for the three and nine months ended September 30, 2014 and 2013. Actual results could differ from those estimates. In our opinion, the accompanying unaudited interim consolidated financial statements reflect all adjustments necessary for a fair statement of our financial position as of September 30, 2014 and December 31, 2013, the results of our operations and comprehensive income for each of the three and nine months ended September 30, 2014 and 2013, and our cash flows for each of the nine months ended September 30, 2014 and 2013; all adjustments are of a normal recurring nature.
	Recent Accounting Pronouncements
	In April 2014, the FASB issued Accounting Standards Update No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" ("ASU 2014-08"). ASU 2014-08 changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. ASU 2014-08 is effective for annual periods beginning on or after December 15, 2014, and interim periods within those annual periods and is to be applied prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date. Upon adoption, we anticipate the disposition of properties, as well as the classification of properties held for sale, will generally no longer meet the guidance to be classified as discontinued operations.
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"). ASU 2014-09 is based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those good or services. ASU 2014-09 is effective for annual periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. We are currently evaluating the potential effects on the consolidated financial statements.

Investment_in_Real_Estate

Investment in Real Estate	9 Months Ended
	Sep. 30, 2014
Real Estate Investment Property, Net [Abstract]	'
Investment in Real Estate	'
	3. Investment in Real Estate
	Acquisitions
	During the nine months ended September 30, 2014, we acquired three industrial properties comprising approximately 0.5 million square feet of GLA and several land parcels. The purchase price of these acquisitions totaled approximately $43,246, excluding costs incurred in conjunction with the acquisition of the industrial properties and land parcels. The purchase price of the industrial properties and land parcels acquired was allocated as follows:
		Nine Months Ended September 30, 2014
	Land	$	19,840
	Building and Improvements	16,946
	Other Assets	897
	Deferred Leasing Intangibles, Net	5,563
	Total Purchase Price	$	43,246
	Intangible Assets (Liabilities) Subject To Amortization in the Period of Acquisition
	The fair value at the date of acquisition of in-place leases, tenant relationships, a below market ground lease obligation and above and below market leases recorded due to the real estate properties acquired for the nine months ended September 30, 2014, which are recorded as deferred leasing intangibles, are as follows:
		Nine Months Ended September 30, 2014
	In-Place Leases	$	2,660
	Tenant Relationships	$	1,620
	Above Market Leases	$	219
	Below Market Ground Lease Obligation	$	1,854
	Below Market Leases	$	(790	)
	The weighted average life, in months, of in-place leases, tenant relationships, a below market ground lease obligation and above and below market leases recorded at the time of acquisition as a result of the real estate properties acquired for the nine months ended September 30, 2014 is as follows:
		Nine Months Ended September 30, 2014
	In-Place Leases	71
	Tenant Relationships	130
	Above Market Leases	83
	Below Market Ground Lease Obligation	480
	Below Market Leases	71
	Sales and Discontinued Operations
	During the nine months ended September 30, 2014, we sold 16 industrial properties comprising approximately 0.9 million square feet of GLA. Gross proceeds from the sales of the industrial properties were approximately $50,510. The gain on sale of real estate was approximately $12,291. The 16 sold industrial properties meet the criteria to be included in discontinued operations. Therefore the results of operations and gain on sale of real estate for the 16 industrial properties sold are included in discontinued operations.
	At September 30, 2014, we had two industrial properties comprising approximately 0.2 million square feet of GLA held for sale. The results of operations of these industrial properties held for sale at September 30, 2014 are included in discontinued operations. There can be no assurance that such industrial properties held for sale will be sold.
	Income from discontinued operations for the nine months ended September 30, 2013 reflects the results of operations of the 16 industrial properties that were sold during the nine months ended September 30, 2014, the results of operations of the 65 industrial properties that were sold during the year ended December 31, 2013, the results of operations of the two industrial properties identified as held for sale at September 30, 2014 and the net gain on sale of real estate relating to 18 industrial properties that were sold during the nine months ended September 30, 2013.
	The following table discloses certain information regarding the industrial properties included in our discontinued operations for the three and nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013				Nine Months Ended September 30, 2014				Nine Months Ended September 30, 2013
	Total Revenues	$	811		$	3,605			$	3,876			$	13,353
	Property Expenses	(324		)	(1,306		)		(1,384		)		(4,965		)
	Impairment of Real Estate	—			—				—				(1,605		)
	Depreciation and Other Amortization	(187		)	(1,463		)		(1,446		)		(5,331		)
	Gain on Sale of Real Estate	11,577			3,613				12,291				14,020
	Income from Discontinued Operations	$	11,877		$	4,449			$	13,337			$	15,472
	Impairment Charges
	The impairment charges of $2,652 recorded during the nine months ended September 30, 2013, of which $1,605 is included in discontinued operations, were due to marketing certain properties for sale and our assessment of the likelihood and timing of a potential sale transaction.
	The following table presents information about our real estate assets that were measured at fair value on a non-recurring basis and for which impairment charges were recorded during the nine months ended September 30, 2013. The table indicates the fair value hierarchy of the valuation techniques we utilized to determine fair value.
		Fair Value Measurements on a Non-Recurring Basis Using:
	Description	At September 30, 2013			Quoted Prices in			Significant Other			Unobservable				Total
					Active Markets for			Observable Inputs			Inputs				Impairment for the Nine Months Ended
					Identical Assets			(Level 2)			(Level 3)
					(Level  1)
	Operating Property Not Held for Sale*	$	6,875		—			—			$	6,875			$	(1,047	)
	*Excludes industrial properties for which impairment of $1,605 was recorded during the nine months ended September 30, 2013 since the related assets were sold or recorded at carrying value, which is lower than estimated fair value at September 30, 2013.
	The following table presents quantitative information about the Level 3 fair value measurements at September 30, 2013.
	Quantitative Information about Level 3 Fair Value Measurements:
	Description		Fair Value			Valuation Technique		Unobservable Inputs		Range
	One industrial property comprising approximately 0.5 million square feet of GLA		$	6,875		Contracted Price		(A)		N/A
	(A)	The fair value for the property was based upon the value of a third party purchase contract, which was subject to our corroboration for reasonableness.

Investments_in_and_Advances_to

Investments in and Advances to Other Real Estate Partnerships	9 Months Ended
	Sep. 30, 2014
Investment in and Advances to Other Real Estate Partnerships [Abstract]	'
Investments in and Advances to Other Real Estate Partnerships	'
	4. Investments in and Advances to Other Real Estate Partnerships
	The investments in and advances to Other Real Estate Partnerships reflects the Operating Partnership’s limited partnership equity interests in the entities referred to in Note 1 to these consolidated financial statements.
	Summarized condensed financial information as derived from the financial statements of the Other Real Estate Partnerships is presented below:
	Condensed Combined Balance Sheets:
		September 30, 2014			December 31, 2013
	ASSETS
	Assets:
	Net Investment in Real Estate	$	277,534		$	276,294
	Note Receivable	18,023			119,364
	Other Assets, Net	26,862			33,234
	Total Assets	$	322,419		$	428,892
	LIABILITIES AND PARTNERS’ CAPITAL
	Liabilities:
	Mortgage Loans Payable	$	81,623		$	97,675
	Other Liabilities, Net	19,953			13,795
	Partners’ Capital	220,843			317,422
	Total Liabilities and Partners’ Capital	$	322,419		$	428,892
	Operating Partnership’s Share of Equity	$	219,886		$	316,188
	Basis Differential (1)	(17,951		)	(119,865		)
	Carrying Value of the Operating Partnership’s Investments in Other Real Estate Partnerships	$	201,935		$	196,323
	_____________________
	-1	This amount represents the aggregate difference between the Operating Partnership’s historical cost basis and the basis reflected at the Other Real Estate Partnerships’ level. The basis differential relates to the elimination of a note receivable and related accrued interest between a Other Real Estate Partnership and wholly owned subsidiaries of the Operating Partnership.
	Condensed Combined Statements of Operations:
		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2014			Nine Months Ended September 30, 2013
	Total Revenues	$	10,151		$	9,694		$	30,437		$	28,648
	Property Expenses	(2,920		)	(2,813		)	(9,319		)	(8,707		)
	Depreciation and Other Amortization	(3,092		)	(2,973		)	(8,843		)	(8,812		)
	Interest Income	130			1,237			1,192			3,809
	Interest Expense	(1,144		)	(1,079		)	(3,770		)	(3,541		)
	Amortization of Deferred Financing Costs	(37		)	(45		)	(125		)	(142		)
	Loss from Retirement of Debt	(3		)	—			(133		)	(214		)
	Income from Continuing Operations	3,085			4,021			9,439			11,041
	Discontinued Operations:
	Income Attributable to Discontinued Operations	9			113			56			274
	Gain on Sale of Real Estate	1,851			1,630			2,192			1,630
	Income from Discontinued Operations	1,860			1,743			2,248			1,904
	Gain on Sale of Real Estate	—			70			—			70
	Net Income	$	4,945		$	5,834		$	11,687		$	13,015

Indebtedness

Indebtedness	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Indebtedness	'
	5. Indebtedness
	The following table discloses certain information regarding our indebtedness:
		Outstanding						Interest		Effective Interest	Maturity Date
		Balance at						Rate at		Rate at
								September 30,		Issuance
		September 30, 2014			December 31,			2014
					2013
	Mortgage Loans Payable, Net	$	521,304		$	580,215		4.03% – 8.26%		4.03% – 8.26%	February 2016 – September 2022
	Unamortized Premiums	(96		)	(115		)
	Mortgage Loans Payable, Gross	$	521,208		$	580,100
	Senior Unsecured Notes, Net
	2016 Notes	$	159,607		$	159,566		5.75%		5.91%	1/15/16
	2017 Notes	54,964			54,960			7.50%		7.52%	12/1/17
	2027 Notes	6,066			6,066			7.15%		7.11%	5/15/27
	2028 Notes	31,884			31,883			7.60%		8.13%	7/15/28
	2032 Notes	10,517			10,514			7.75%		7.87%	4/15/32
	2014 Notes	—			81,149			N/A		N/A	6/1/14
	2017 II Notes	101,799			101,778			5.95%		6.37%	5/15/17
	Subtotal	$	364,837		$	445,916
	Unamortized Discounts	265			980
	Senior Unsecured Notes, Gross	$	365,102		$	446,896
	Unsecured Term Loan*	$	200,000		N/A			1.91%		1.91%	1/29/21
	Unsecured Credit Facility**	$	176,000		$	173,000		1.66%		1.66%	9/29/17
	* We entered into interest rate protection agreements, with an aggregate notional value of $200,000, to effectively convert the variable rate to a fixed rate. See Note 11.
	** The maturity date may be extended an additional year at our election, subject to certain restrictions.
	Mortgage Loans Payable, Net
	During the nine months ended September 30, 2014, we paid off and retired prior to maturity mortgage loans payable in the amount of $59,680. In connection with these prepayments, we recognized $522 as a loss from retirement of debt for the nine months ended September 30, 2014.
	On August 5, 2014, we assumed a mortgage loan payable from one of our Other Real Estate Partnerships totaling $8,872.
	As of September 30, 2014, mortgage loans payable are collateralized, and in some instances cross-collateralized, by industrial properties with a net carrying value of $667,638. We believe the Operating Partnership and the Company were in compliance with all covenants relating to mortgage loans payable as of September 30, 2014.
	Senior Unsecured Notes, Net
	During the nine months ended September 30, 2014, we paid off and retired our 2014 Notes, at maturity, in the amount of $81,794.
	Unsecured Term Loan
	On January 29, 2014, we entered into a seven-year, $200,000 unsecured loan (the "Unsecured Term Loan") with a syndicate of financial institutions. The Unsecured Term Loan requires interest only payments and bears interest at a variable rate based on LIBOR, as defined in the loan agreement, plus a specified spread based on our leverage ratio or credit ratings.
	Indebtedness
	The following is a schedule of the stated maturities and scheduled principal payments of our indebtedness, exclusive of premiums and discounts, for the next five years as of September 30, 2014 and thereafter:
		Amount
	Remainder of 2014	$	2,544
	2015	10,537
	2016	250,164
	2017	342,927
	2018	127,107
	Thereafter	529,031
	Total	$	1,262,310
	Our unsecured revolving credit facility (the "Unsecured Credit Facility"), Unsecured Term Loan and the indentures governing our senior unsecured notes contain certain financial covenants, including limitations on incurrence of debt and debt service coverage. Under the Unsecured Credit Facility and Unsecured Term Loan, an event of default can also occur if the lenders, in their good faith judgment, determine that a material adverse change has occurred which could prevent timely repayment or materially impair our ability to perform our obligations under the loan agreements. We believe that we were in compliance with all covenants relating to the Unsecured Credit Facility, Unsecured Term Loan and indentures governing our senior unsecured notes as of September 30, 2014. However, these financial covenants are complex and there can be no assurance that these provisions would not be interpreted by our lenders in a manner that could impose and cause us to incur material costs.
	Fair Value
	At September 30, 2014 and December 31, 2013, the fair value of our indebtedness was as follows:
		30-Sep-14						December 31, 2013
		Carrying			Fair			Carrying			Fair
		Amount			Value			Amount			Value
	Mortgage Loans Payable, Net	$	521,304		$	555,933		$	580,215		$	585,449
	Senior Unsecured Debt, Net	364,837			398,655			445,916			482,781
	Unsecured Term Loan	200,000			200,597			N/A			N/A
	Unsecured Credit Facility	176,000			176,258			173,000			173,000
	Total	$	1,262,141		$	1,331,443		$	1,199,131		$	1,241,230
	The fair values of our mortgage loans payable were determined by discounting the future cash flows using the current rates at which similar loans would be made based upon similar remaining maturities. The current market rates we utilized were internally estimated. The fair value of the senior unsecured debt was determined by using rates, as advised by our bankers in certain cases, that are based upon recent trades within the same series of the senior unsecured debt, recent trades for senior unsecured debt with comparable maturities, recent trades for fixed rate unsecured debt from companies with profiles similar to ours, as well as overall economic conditions. The fair value of the Unsecured Credit Facility and Unsecured Term Loan was determined by discounting the future cash flows using current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining term, assuming no repayment until maturity. We have concluded that our determination of fair value for each of our mortgage loans payable, senior unsecured debt, Unsecured Term Loan and Unsecured Credit Facility was primarily based upon Level 3 inputs.

Partners_Capital

Partners' Capital	9 Months Ended
	Sep. 30, 2014
Partners' Capital [Abstract]	'
Partners' Capital	'
	6. Partners’ Capital
	Preferred Contributions
	On March 6, 2014, the Company redeemed all 50,000 depositary shares, each representing 1/100th of a share, of the Company's 6.236%, Series F Flexible Cumulative Redeemable Preferred Stock, $0.01 par value (the "Series F Preferred Stock"), at a redemption price of $1,000.00 per depositary share, and paid a quarterly dividend of $11.3299 per depositary share, totaling $566. An equivalent number of Series F Cumulative Preferred Units (the "Series F Preferred Units") were redeemed on March 6, 2014 as well.
	On March 31, 2014, the Company redeemed all 25,000 depositary shares, each representing 1/100th of a share, of the Company's 7.236%, Series G Flexible Cumulative Redeemable Preferred Stock, $0.01 par value (the "Series G Preferred Stock"), at a redemption price of $1,000.00 per depositary share, and paid a semi-annual dividend of $36.18 per depositary share, totaling $905. An equivalent number of Series G Cumulative Preferred Units (the "Series G Preferred Units") were redeemed on March 31, 2014 as well.
	The initial offering costs associated with the issuance of the Series F and Series G Preferred Units, as well as costs associated with the redemptions, totaled $1,462 and are reflected as a deduction from net income in determining earnings per unit for the nine months ended September 30, 2014.
	The Company has 10,000,000 shares of preferred stock authorized. At September 30, 2014 and December 31, 2013, the Company had 0 and 750 shares of preferred stock outstanding, respectively.
	Unit Contributions
	During the nine months ended September 30, 2014 and 2013, 175,333 and 99,508, respectively, limited partnership units were converted into an equivalent number of general partnership units, resulting in a reclassification of $1,697 and $943 between Limited Partners Units and General Partner Units.
	Distributions
	The coupon rate of our Series F Preferred Units reset every quarter at 2.375% plus the greater of (i) the 30 year Treasury constant maturity treasury ("CMT") Rate, (ii) the 10 year Treasury CMT Rate or (iii) 3-month LIBOR. For the period January 1, 2014 through March 6, 2014 (the redemption date), the coupon rate was 6.275%.
	The following table summarizes distributions accrued during the nine months ended September 30, 2014:
		Total
		Distribution
	General Partner/Limited Partner Units	$	35,416
	Series F Preferred Units	$	566
	Series G Preferred Units	$	453

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Loss [Abstract]	'
Accumulated Other Comprehensive Loss	'
	7. Accumulated Other Comprehensive Loss
	The following tables summarize the changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2014 and the reclassifications out of accumulated other comprehensive loss for the three and nine months ended September 30, 2014 and 2013:
		Interest Rate Protection Agreements			Foreign Currency Translation Adjustment			Total
	Balance as of December 31, 2013	$	(3,481	)	$	119		$	(3,362	)
	Other Comprehensive Loss Before Reclassifications	(3,807		)	(76		)	(3,883		)
	Amounts Reclassified from Accumulated Other Comprehensive Loss	4,129			—			4,129
	Net Current Period Other Comprehensive Income (Loss)	322			(76		)	246
	Balance as of September 30, 2014	$	(3,159	)	$	43		$	(3,116	)
			Amount Reclassified from Accumulated Other Comprehensive Loss
	Details about Accumulated Other Comprehensive Loss Components		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2014		Nine Months Ended September 30, 2013		Affected Line Item in the Consolidated Statements of Operations
	Interest Rate Protection Agreements
	Amortization of Interest Rate Protection Agreements (Previously Settled)		$	131		$	609		$	1,227	$	1,792	Interest Expense
	Settlement Payments to our Counterparties		1,090			—			2,902		—		Interest Expense
	Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements		—			17			—		1,116		Loss from Retirement of Debt
			$	1,221		$	626		$	4,129	$	2,908	Total
	The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in other comprehensive income and is subsequently reclassified to earnings through interest expense over the life of the derivative or over the life of the debt. In the next 12 months, we expect to amortize approximately $523 into net income by increasing interest expense for interest rate protection agreements we settled in previous periods. Additionally, recurring settlement amounts on the Group I Swaps, as defined in Note 11, will also be reclassified to net income. See Note 11 for more information about our derivatives.

Supplemental_Information_to_St

Supplemental Information to Statements of Cash Flows	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]	'
Supplemental Information to Statements of Cash Flows	'
	8. Supplemental Information to Statements of Cash Flows
		Nine Months Ended September 30, 2014			Nine Months Ended September 30, 2013
	Interest Expense Capitalized in Connection with Development Activity	$	1,030		$	2,447
	Supplemental Schedule of Non-Cash Investing and Financing Activities:
	Distribution Payable on General and Limited Partner Units	$	11,886		$	9,788
	Exchange of Limited Partnership Units for General Partnership Units:
	Limited Partnership Units	$	(1,697	)	$	(943	)
	General Partnership Units	1,697			943
	Total	$	—		$	—
	Assumption of Liabilities in Connection with the Acquisition of Real Estate	$	269		$	298
	Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	$	21,875		$	6,369
	Mortgage Loan Payable Assumed from Other Real Estate Partnership:
	Prepaid Expenses and Other Assets, Net	$	8,872		$	—
	Mortgage Loans Payable, Net	(8,872		)	—
	Total	$	—		$	—
	Write-off of Fully Depreciated Assets	$	(25,896	)	$	(36,992	)

Earnings_Per_Unit_EPU

Earnings Per Unit (EPU)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Unit (EPU)	'
	9. Earnings Per Unit ("EPU")
	The computation of basic and diluted EPU is presented below:
		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2014			Nine Months Ended September 30, 2013
	Numerator:
	Income from Continuing Operations	$	10,341		$	4,068		$	18,186		$	3,048
	Gain on Sale of Real Estate	—			221			—			483
	Income from Continuing Operations Allocable to Participating Securities	(42		)	(6		)	(67		)	—
	Preferred Unit Distributions	—			(1,392		)	(1,019		)	(7,506		)
	Redemption of Preferred Units	—			(2,121		)	(1,462		)	(5,667		)
	Income (Loss) from Continuing Operations Available to Unitholders	$	10,299		$	770		$	15,638		$	(9,642	)
	Income from Discontinued Operations	$	11,877		$	4,449		$	13,337		$	15,472
	Income from Discontinued Operations Allocable to Participating Securities	(48		)	(36		)	(56		)	(120		)
	Income from Discontinued Operations Attributable to Unitholders	$	11,829		$	4,413		$	13,281		$	15,352
	Net Income Available to Unitholders and Participating Securities	$	22,218		$	5,225		$	29,042		$	5,830
	Net Income Allocable to Participating Securities	(90		)	(42		)	(123		)	(120		)
	Net Income Available to Unitholders	$	22,128		$	5,183		$	28,919		$	5,710
	Denominator:
	Weighted Average Units—Basic	114,512			114,089			114,346			110,823
	Effect of Dilutive Securities that Result in the Issuance of General Partner Units:
	LTIP Unit Awards	199			315			442			—
	Weighted Average Units—Diluted	114,711			114,404			114,788			110,823
	Basic and Diluted EPU:
	Income (Loss) from Continuing Operations Available to Unitholders	$	0.09		$	0		$	0.14		$	(0.09	)
	Income from Discontinued Operations Attributable to Unitholders	$	0.1		$	0.04		$	0.11		$	0.14
	Net Income Available to Unitholders	$	0.19		$	0.04		$	0.25		$	0.05
	Participating securities include Units that correspond to the Company's 463,774 and 489,381 of unvested restricted stock awards outstanding at September 30, 2014 and 2013, respectively, which participate in non-forfeitable distributions of the Operating Partnership. Under the two class method, participating security holders are allocated income, in proportion to total weighted average units outstanding, based upon the greater of net income (after reduction for preferred unit distributions and redemption of preferred units) or common distributions declared.
	Effective July 1, 2013, the Board of Directors granted performance awards ("LTIP Unit Awards") to certain officers and employees of the Company. The LTIP Unit Awards, which do not participate in non-forfeitable dividends of the Company, are dilutive and are included in the calculation of diluted EPU for the three months ended September 30, 2014 and 2013 and nine months ended September 30, 2014.
	The number of weighted average units—diluted is the same as the number of weighted average units—basic for the nine months ended September 30, 2013, as the effect of the LTIP Unit Awards outstanding at September 30, 2013, was excluded as its inclusion would have been antidilutive to the loss from continuing operations available to Unitholders.

Stock_Based_Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2014
Share-based Compensation [Abstract]	'
Stock Based Compensation	'
	10. Stock Based Compensation
	During the nine months ended September 30, 2014, we awarded 299,805 shares of restricted stock awards to certain employees, which had a fair value of $5,413 on the date of approval by either the Compensation Committee of the Board of Directors or the approval date of the Company's 2014 Stock Incentive Plan. These restricted stock awards were issued based upon the achievement of certain corporate performance goals for the calendar year 2013 and generally vest over a period of three years. Additionally, during the nine months ended September 30, 2014, we awarded 19,250 shares of restricted stock to non-employee members of the Board of Directors, which had a fair value of $350 on the date of approval. These restricted stock awards vest over a one-year period. We issued Units to the Company in the same amount for both award issuances.
	Compensation expense will be charged to earnings over the vesting periods for the shares expected to vest except if the recipient is not required to provide future service in exchange for vesting of such shares. If vesting of a recipient's restricted stock award is not contingent upon future service, the expense is recognized immediately at the date of grant. During the nine months ended September 30, 2014 and 2013, we recognized $1,451 and $1,008, respectively, of compensation expense related to restricted stock awards granted to our Chief Executive Officer for which future service was not required.
	We recognized $1,351 and $1,769 for the three months ended September 30, 2014 and 2013, and $6,248 and $4,436 for the nine months ended September 30, 2014 and 2013, respectively, in amortization related to restricted stock and unit awards and LTIP Unit Awards, of which $6 and $11 was capitalized for the three months ended September 30, 2014 and 2013, and $36 and $24 was capitalized for the nine months ended September 30, 2014 and 2013, respectively, in connection with development activities. At September 30, 2014, we had $6,437 in unrecognized compensation related to unvested restricted stock awards and LTIP Unit Awards. The weighted average period that the unrecognized compensation is expected to be recognized is 0.86 years.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives	'
	11. Derivatives
	Our objectives in using derivatives are to add stability to interest expense and to manage our cash flow volatility and exposure to interest rate movements. To accomplish this objective, we primarily use interest rate protection agreements as part of our interest rate risk management strategy. Interest rate protection agreements designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
	In connection with origination of the Unsecured Term Loan (see Note 5), during January 2014, we entered into four interest rate protection agreements, with an aggregate notional value of $200,000, to manage our exposure to changes in the one month LIBOR rate (the “Group I Swaps”). The Group I Swaps fix the LIBOR rate at a weighted average rate of 2.29% and mature on January 29, 2021.We designated the Group I Swaps as cash flow hedges.
	In order to maintain our flexibility to pursue an offering of unsecured debt in the future, during August 2014, we entered into three interest rate protection agreements, with an aggregate notional value of $220,000, to manage our exposure to changes in the three month LIBOR rate (the "Group II Swaps"; together with the Group I Swaps, the "Swaps"). The Group II Swaps fix the LIBOR rate at a rate of 2.5795% and are effective from December 1, 2014 through December 1, 2024. We designated the Group II Swaps as cash flow hedges.
	Our agreements with our derivative counterparties contain provisions where if we default on any of our indebtedness, then we could also be declared in default on our derivative obligations subject to certain thresholds. As of September 30, 2014, we have not posted any collateral related to these agreements and were not in breach of any of the agreement provisions. If we had breached these provisions, we could have been required to settle our obligations under the agreements at their termination value.
	The following table sets forth our financial assets and liabilities related to the Swaps, which are included in Prepaid Expenses and Other Assets, Net and Accounts Payable, Accrued Expenses and Other Liabilities on the accompanying consolidated balance sheet and are accounted for at fair value on a recurring basis as of September 30, 2014:
					Fair Value Measurements at Reporting Date Using:
	Description	Fair Value			Quoted Prices in	Significant Other			Unobservable
					Active Markets for	Observable Inputs			Inputs
					Identical Assets	(Level 2)			(Level 3)
					(Level 1)
	Assets:
	Group II Swaps	$	2,237		—	$	2,237		—
	Liabilities:
	Group I Swaps	$	(3,142	)	—	$	(3,142	)	—
	There was no ineffectiveness recorded on the Swaps during the three and nine months ended September 30, 2014. See Note 7 for more information.
	The estimated fair value of the Swaps was determined using the market standard methodology of netting the discounted fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of interest rates (forward curves) derived from observable market interest rate curves. In addition, credit valuation adjustments are incorporated in the fair value to account for potential non-performance risk, including our own non-performance risk and the respective counterparty’s non-performance risk. We determined that the significant inputs used to value the Swaps fell within Level 2 of the fair value hierarchy.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	12. Commitments and Contingencies
	In the normal course of business, we are involved in legal actions arising from the ownership of our industrial properties. In our opinion, the liabilities, if any, that may ultimately result from such legal actions are not expected to have a materially adverse effect on our consolidated financial position, operations or liquidity.
	In conjunction with the development of industrial properties, we have entered into agreements with general contractors for the construction of industrial buildings. At September 30, 2014, we have five industrial buildings totaling approximately 1.2 million square feet of GLA that are under construction. The estimated total construction costs as of September 30, 2014 are approximately $64,700. Of this amount, approximately $24,900 remains to be funded. There can be no assurance that the actual completion cost will not exceed the estimated completion cost stated above.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	13. Subsequent Events
	From October 1, 2014 to October 30, 2014, we sold two industrial properties and a certain land parcel for approximately $3,285. The land parcel sold was located in Ontario, Canada and was our sole remaining real estate asset located in Canada. There were no industrial properties acquired during the period.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In April 2014, the FASB issued Accounting Standards Update No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" ("ASU 2014-08"). ASU 2014-08 changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. ASU 2014-08 is effective for annual periods beginning on or after December 15, 2014, and interim periods within those annual periods and is to be applied prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date. Upon adoption, we anticipate the disposition of properties, as well as the classification of properties held for sale, will generally no longer meet the guidance to be classified as discontinued operations.
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"). ASU 2014-09 is based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those good or services. ASU 2014-09 is effective for annual periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. We are currently evaluating the potential effects on the consolidated financial statements.

Investment_in_Real_Estate_Tabl

Investment in Real Estate (Tables)	9 Months Ended
	Sep. 30, 2014
Real Estate Investment Property, Net [Abstract]	'
Summary of Acquisition Purchase Price Allocation	'
	The purchase price of the industrial properties and land parcels acquired was allocated as follows:
		Nine Months Ended September 30, 2014
	Land	$	19,840
	Building and Improvements	16,946
	Other Assets	897
	Deferred Leasing Intangibles, Net	5,563
	Total Purchase Price	$	43,246
Summary of Intangible Assets (Liabilities) Subject to Amortization in the Period of Acquisition	'
	The fair value at the date of acquisition of in-place leases, tenant relationships, a below market ground lease obligation and above and below market leases recorded due to the real estate properties acquired for the nine months ended September 30, 2014, which are recorded as deferred leasing intangibles, are as follows:
		Nine Months Ended September 30, 2014
	In-Place Leases	$	2,660
	Tenant Relationships	$	1,620
	Above Market Leases	$	219
	Below Market Ground Lease Obligation	$	1,854
	Below Market Leases	$	(790	)
	The weighted average life, in months, of in-place leases, tenant relationships, a below market ground lease obligation and above and below market leases recorded at the time of acquisition as a result of the real estate properties acquired for the nine months ended September 30, 2014 is as follows:
		Nine Months Ended September 30, 2014
	In-Place Leases	71
	Tenant Relationships	130
	Above Market Leases	83
	Below Market Ground Lease Obligation	480
	Below Market Leases	71
Summary of Industrial Properties Included in Discontinued Operations	'
	The following table discloses certain information regarding the industrial properties included in our discontinued operations for the three and nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013				Nine Months Ended September 30, 2014				Nine Months Ended September 30, 2013
	Total Revenues	$	811		$	3,605			$	3,876			$	13,353
	Property Expenses	(324		)	(1,306		)		(1,384		)		(4,965		)
	Impairment of Real Estate	—			—				—				(1,605		)
	Depreciation and Other Amortization	(187		)	(1,463		)		(1,446		)		(5,331		)
	Gain on Sale of Real Estate	11,577			3,613				12,291				14,020
	Income from Discontinued Operations	$	11,877		$	4,449			$	13,337			$	15,472
Fair Value Measurements on a Nonrecurring Basis	'
	The following table presents information about our real estate assets that were measured at fair value on a non-recurring basis and for which impairment charges were recorded during the nine months ended September 30, 2013. The table indicates the fair value hierarchy of the valuation techniques we utilized to determine fair value.
		Fair Value Measurements on a Non-Recurring Basis Using:
	Description	At September 30, 2013			Quoted Prices in			Significant Other			Unobservable				Total
					Active Markets for			Observable Inputs			Inputs				Impairment for the Nine Months Ended
					Identical Assets			(Level 2)			(Level 3)
					(Level  1)
	Operating Property Not Held for Sale*	$	6,875		—			—			$	6,875			$	(1,047	)
	*Excludes industrial properties for which impairment of $1,605 was recorded during the nine months ended September 30, 2013 since the related assets were sold or recorded at carrying value, which is lower than estimated fair value at September 30, 2013.
Quantitative Information about Level 3 Fair Value Measurements	'
	The following table presents quantitative information about the Level 3 fair value measurements at September 30, 2013.
	Quantitative Information about Level 3 Fair Value Measurements:
	Description		Fair Value			Valuation Technique		Unobservable Inputs		Range
	One industrial property comprising approximately 0.5 million square feet of GLA		$	6,875		Contracted Price		(A)		N/A
	(A)	The fair value for the property was based upon the value of a third party purchase contract, which was subject to our corroboration for reasonableness.

Investments_in_and_Advances_to1

Investments in and Advances to Other Real Estate Partnerships (Tables)	9 Months Ended
	Sep. 30, 2014
Investment in and Advances to Other Real Estate Partnerships [Abstract]	'
Condensed Balance Sheet	'
	Condensed Combined Balance Sheets:
		September 30, 2014			December 31, 2013
	ASSETS
	Assets:
	Net Investment in Real Estate	$	277,534		$	276,294
	Note Receivable	18,023			119,364
	Other Assets, Net	26,862			33,234
	Total Assets	$	322,419		$	428,892
	LIABILITIES AND PARTNERS’ CAPITAL
	Liabilities:
	Mortgage Loans Payable	$	81,623		$	97,675
	Other Liabilities, Net	19,953			13,795
	Partners’ Capital	220,843			317,422
	Total Liabilities and Partners’ Capital	$	322,419		$	428,892
	Operating Partnership’s Share of Equity	$	219,886		$	316,188
	Basis Differential (1)	(17,951		)	(119,865		)
	Carrying Value of the Operating Partnership’s Investments in Other Real Estate Partnerships	$	201,935		$	196,323
	_____________________
	-1	This amount represents the aggregate difference between the Operating Partnership’s historical cost basis and the basis reflected at the Other Real Estate Partnerships’ level. The basis differential relates to the elimination of a note receivable and related accrued interest between a Other Real Estate Partnership and wholly owned subsidiaries of the Operating Partnership.
Condensed Income Statement	'
	Condensed Combined Statements of Operations:
		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2014			Nine Months Ended September 30, 2013
	Total Revenues	$	10,151		$	9,694		$	30,437		$	28,648
	Property Expenses	(2,920		)	(2,813		)	(9,319		)	(8,707		)
	Depreciation and Other Amortization	(3,092		)	(2,973		)	(8,843		)	(8,812		)
	Interest Income	130			1,237			1,192			3,809
	Interest Expense	(1,144		)	(1,079		)	(3,770		)	(3,541		)
	Amortization of Deferred Financing Costs	(37		)	(45		)	(125		)	(142		)
	Loss from Retirement of Debt	(3		)	—			(133		)	(214		)
	Income from Continuing Operations	3,085			4,021			9,439			11,041
	Discontinued Operations:
	Income Attributable to Discontinued Operations	9			113			56			274
	Gain on Sale of Real Estate	1,851			1,630			2,192			1,630
	Income from Discontinued Operations	1,860			1,743			2,248			1,904
	Gain on Sale of Real Estate	—			70			—			70
	Net Income	$	4,945		$	5,834		$	11,687		$	13,015

Indebtedness_Tables

Indebtedness (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Information Regarding Indebtedness	'
	The following table discloses certain information regarding our indebtedness:
		Outstanding						Interest		Effective Interest	Maturity Date
		Balance at						Rate at		Rate at
								September 30,		Issuance
		September 30, 2014			December 31,			2014
					2013
	Mortgage Loans Payable, Net	$	521,304		$	580,215		4.03% – 8.26%		4.03% – 8.26%	February 2016 – September 2022
	Unamortized Premiums	(96		)	(115		)
	Mortgage Loans Payable, Gross	$	521,208		$	580,100
	Senior Unsecured Notes, Net
	2016 Notes	$	159,607		$	159,566		5.75%		5.91%	1/15/16
	2017 Notes	54,964			54,960			7.50%		7.52%	12/1/17
	2027 Notes	6,066			6,066			7.15%		7.11%	5/15/27
	2028 Notes	31,884			31,883			7.60%		8.13%	7/15/28
	2032 Notes	10,517			10,514			7.75%		7.87%	4/15/32
	2014 Notes	—			81,149			N/A		N/A	6/1/14
	2017 II Notes	101,799			101,778			5.95%		6.37%	5/15/17
	Subtotal	$	364,837		$	445,916
	Unamortized Discounts	265			980
	Senior Unsecured Notes, Gross	$	365,102		$	446,896
	Unsecured Term Loan*	$	200,000		N/A			1.91%		1.91%	1/29/21
	Unsecured Credit Facility**	$	176,000		$	173,000		1.66%		1.66%	9/29/17
	* We entered into interest rate protection agreements, with an aggregate notional value of $200,000, to effectively convert the variable rate to a fixed rate. See Note 11.
	** The maturity date may be extended an additional year at our election, subject to certain restrictions.
Schedule of Maturities of Long-term Debt	'
	The following is a schedule of the stated maturities and scheduled principal payments of our indebtedness, exclusive of premiums and discounts, for the next five years as of September 30, 2014 and thereafter:
		Amount
	Remainder of 2014	$	2,544
	2015	10,537
	2016	250,164
	2017	342,927
	2018	127,107
	Thereafter	529,031
	Total	$	1,262,310
Summary of Indebtedness at Estimated Fair Value	'
	At September 30, 2014 and December 31, 2013, the fair value of our indebtedness was as follows:
		30-Sep-14						December 31, 2013
		Carrying			Fair			Carrying			Fair
		Amount			Value			Amount			Value
	Mortgage Loans Payable, Net	$	521,304		$	555,933		$	580,215		$	585,449
	Senior Unsecured Debt, Net	364,837			398,655			445,916			482,781
	Unsecured Term Loan	200,000			200,597			N/A			N/A
	Unsecured Credit Facility	176,000			176,258			173,000			173,000
	Total	$	1,262,141		$	1,331,443		$	1,199,131		$	1,241,230

Partners_Capital_Tables

Partners' Capital (Tables)	9 Months Ended
	Sep. 30, 2014
Partners' Capital [Abstract]	'
Summary of Dividend Distributions	'
	The following table summarizes distributions accrued during the nine months ended September 30, 2014:
		Total
		Distribution
	General Partner/Limited Partner Units	$	35,416
	Series F Preferred Units	$	566
	Series G Preferred Units	$	453

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Loss [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following tables summarize the changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2014 and the reclassifications out of accumulated other comprehensive loss for the three and nine months ended September 30, 2014 and 2013:
		Interest Rate Protection Agreements			Foreign Currency Translation Adjustment			Total
	Balance as of December 31, 2013	$	(3,481	)	$	119		$	(3,362	)
	Other Comprehensive Loss Before Reclassifications	(3,807		)	(76		)	(3,883		)
	Amounts Reclassified from Accumulated Other Comprehensive Loss	4,129			—			4,129
	Net Current Period Other Comprehensive Income (Loss)	322			(76		)	246
	Balance as of September 30, 2014	$	(3,159	)	$	43		$	(3,116	)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	'
			Amount Reclassified from Accumulated Other Comprehensive Loss
	Details about Accumulated Other Comprehensive Loss Components		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2014		Nine Months Ended September 30, 2013		Affected Line Item in the Consolidated Statements of Operations
	Interest Rate Protection Agreements
	Amortization of Interest Rate Protection Agreements (Previously Settled)		$	131		$	609		$	1,227	$	1,792	Interest Expense
	Settlement Payments to our Counterparties		1,090			—			2,902		—		Interest Expense
	Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements		—			17			—		1,116		Loss from Retirement of Debt
			$	1,221		$	626		$	4,129	$	2,908	Total

Supplemental_Information_to_St1

Supplemental Information to Statements of Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]	'
Cash Flow Information	'
		Nine Months Ended September 30, 2014			Nine Months Ended September 30, 2013
	Interest Expense Capitalized in Connection with Development Activity	$	1,030		$	2,447
	Supplemental Schedule of Non-Cash Investing and Financing Activities:
	Distribution Payable on General and Limited Partner Units	$	11,886		$	9,788
	Exchange of Limited Partnership Units for General Partnership Units:
	Limited Partnership Units	$	(1,697	)	$	(943	)
	General Partnership Units	1,697			943
	Total	$	—		$	—
	Assumption of Liabilities in Connection with the Acquisition of Real Estate	$	269		$	298
	Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	$	21,875		$	6,369
	Mortgage Loan Payable Assumed from Other Real Estate Partnership:
	Prepaid Expenses and Other Assets, Net	$	8,872		$	—
	Mortgage Loans Payable, Net	(8,872		)	—
	Total	$	—		$	—
	Write-off of Fully Depreciated Assets	$	(25,896	)	$	(36,992	)

Earnings_Per_Unit_EPU_Tables

Earnings Per Unit (EPU) (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings Per Unit	'
	The computation of basic and diluted EPU is presented below:
		Three Months Ended September 30, 2014			Three Months Ended September 30, 2013			Nine Months Ended September 30, 2014			Nine Months Ended September 30, 2013
	Numerator:
	Income from Continuing Operations	$	10,341		$	4,068		$	18,186		$	3,048
	Gain on Sale of Real Estate	—			221			—			483
	Income from Continuing Operations Allocable to Participating Securities	(42		)	(6		)	(67		)	—
	Preferred Unit Distributions	—			(1,392		)	(1,019		)	(7,506		)
	Redemption of Preferred Units	—			(2,121		)	(1,462		)	(5,667		)
	Income (Loss) from Continuing Operations Available to Unitholders	$	10,299		$	770		$	15,638		$	(9,642	)
	Income from Discontinued Operations	$	11,877		$	4,449		$	13,337		$	15,472
	Income from Discontinued Operations Allocable to Participating Securities	(48		)	(36		)	(56		)	(120		)
	Income from Discontinued Operations Attributable to Unitholders	$	11,829		$	4,413		$	13,281		$	15,352
	Net Income Available to Unitholders and Participating Securities	$	22,218		$	5,225		$	29,042		$	5,830
	Net Income Allocable to Participating Securities	(90		)	(42		)	(123		)	(120		)
	Net Income Available to Unitholders	$	22,128		$	5,183		$	28,919		$	5,710
	Denominator:
	Weighted Average Units—Basic	114,512			114,089			114,346			110,823
	Effect of Dilutive Securities that Result in the Issuance of General Partner Units:
	LTIP Unit Awards	199			315			442			—
	Weighted Average Units—Diluted	114,711			114,404			114,788			110,823
	Basic and Diluted EPU:
	Income (Loss) from Continuing Operations Available to Unitholders	$	0.09		$	0		$	0.14		$	(0.09	)
	Income from Discontinued Operations Attributable to Unitholders	$	0.1		$	0.04		$	0.11		$	0.14
	Net Income Available to Unitholders	$	0.19		$	0.04		$	0.25		$	0.05

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair Value Measurements on Recurring Basis	'
	The following table sets forth our financial assets and liabilities related to the Swaps, which are included in Prepaid Expenses and Other Assets, Net and Accounts Payable, Accrued Expenses and Other Liabilities on the accompanying consolidated balance sheet and are accounted for at fair value on a recurring basis as of September 30, 2014:
					Fair Value Measurements at Reporting Date Using:
	Description	Fair Value			Quoted Prices in	Significant Other			Unobservable
					Active Markets for	Observable Inputs			Inputs
					Identical Assets	(Level 2)			(Level 3)
					(Level 1)
	Assets:
	Group II Swaps	$	2,237		—	$	2,237		—
	Liabilities:
	Group I Swaps	$	(3,142	)	—	$	(3,142	)	—

Organization_and_Formation_of_1

Organization and Formation of Partnership - Additional Information (Detail)	Sep. 30, 2014
	Property
	sqft
	State
	Joint_Ventures
Organization And Formation Of Company [Line Items]	'
Ownership interest of sole general partner	96.20%
Ownership interest of limited partners	3.80%
Number of joint ventures	2
Number of industrial properties owned	576
Number of states in which industrial properties are located	24
Gross leasable area (GLA) of industrial properties owned	55,400,000
Other Real Estate Partnerships	'
Organization And Formation Of Company [Line Items]	'
Minimum ownership interest in limited partnerships	99.00%
Number of limited partnerships	8
Minimum ownership interest of limited partnerships	0.01%
Number of industrial properties owned	62
Gross leasable area (GLA) of industrial properties owned	7,900,000
2003 Net Lease Joint Venture	'
Organization And Formation Of Company [Line Items]	'
Number of industrial properties owned	1
Gross leasable area (GLA) of industrial properties owned	800,000

Investment_in_Real_Estate_Addi

Investment in Real Estate - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
			Property	Property	Property
			sqft
Real Estate Investment Property, Net [Abstract]	'	'	'	'	'
Number of industrial properties acquired	'	'	3	'	'
Gross leasable area (GLA) of industrial properties acquired	'	'	500,000	'	'
Purchase price of acquisitions	'	'	$43,246	'	'
Number of industrial properties sold	'	'	16	'	'
Gross leasable area (GLA) of industrial properties sold	'	'	900,000	'	'
Proceeds from sale of industrial properties	'	'	50,510	'	'
Gain on sale of real estate	'	'	12,291	14,503	'
Number of sold industrial properties included in discontinued operations	'	'	16	18	65
Number of industrial properties held for sale	'	'	2	'	'
Gross leasable area (GLA) of industrial properties held for sale	'	'	200,000	'	'
Impairment of real estate	'	'	0	2,652	'
Impairment of real estate included in discontinued operations	$0	$0	$0	$1,605	'

Investment_in_Real_Estate_Summ

Investment in Real Estate - Summary of Acquisition Purchase Price Allocation (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Real Estate Investment Property, Net [Abstract]	'
Land	$19,840
Building and Improvements	16,946
Other Assets	897
Deferred Leasing Intangibles, Net	5,563
Total Purchase Price	$43,246

Investment_in_Real_Estate_Summ1

Investment in Real Estate - Summary of Intangible Assets (Liabilities) Subject to Amortization in the Period of Acquisition (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
In-Place Leases	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Acquired finite lived intangible asset, fair value	$2,660
Acquired finite lived intangible asset, weighted average life	'71 months
Tenant Relationships	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Acquired finite lived intangible asset, fair value	1,620
Acquired finite lived intangible asset, weighted average life	'130 months
Above Market Leases	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Acquired finite lived intangible asset, fair value	219
Acquired finite lived intangible asset, weighted average life	'83 months
Below Market Ground Lease	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Acquired finite lived intangible asset, fair value	1,854
Acquired finite lived intangible asset, weighted average life	'480 months
Below Market Leases	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Acquired finite lived intangible asset, fair value	($790)
Acquired finite lived intangible asset, weighted average life	'71 months

Investment_in_Real_Estate_Summ2

Investment in Real Estate - Summary of Industrial Properties Included in Discontinued Operations (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Real Estate Investment Property, Net [Abstract]	'	'	'	'
Total Revenues	$811	$3,605	$3,876	$13,353
Property Expenses	-324	-1,306	-1,384	-4,965
Impairment of Real Estate	0	0	0	-1,605
Depreciation and Other Amortization	-187	-1,463	-1,446	-5,331
Gain on Sale of Real Estate	11,577	3,613	12,291	14,020
Income from Discontinued Operations	$11,877	$4,449	$13,337	$15,472

Investment_in_Real_Estate_Fair

Investment in Real Estate - Fair Value Measurements on Non-Recurring Basis (Detail) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Fair Value Assets Measured On Nonrecurring Basis [Line Items]	'	'		'	'
Total Impairment	$0	($1,047)		$0	($1,047)	[1]
Fair Value, Measurements, Nonrecurring	'	'		'	'
Fair Value Assets Measured On Nonrecurring Basis [Line Items]	'	'		'	'
Operating Property Not Held for Sale	'	6,875	[1]	'	6,875	[1]
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'		'	'
Fair Value Assets Measured On Nonrecurring Basis [Line Items]	'	'		'	'
Operating Property Not Held for Sale	'	0		'	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)	'	'		'	'
Fair Value Assets Measured On Nonrecurring Basis [Line Items]	'	'		'	'
Operating Property Not Held for Sale	'	0		'	0
Fair Value, Measurements, Nonrecurring | Unobservable Inputs (Level 3)	'	'		'	'
Fair Value Assets Measured On Nonrecurring Basis [Line Items]	'	'		'	'
Operating Property Not Held for Sale	'	$6,875	[1]	'	$6,875	[1]
[1]	Excludes industrial properties for which impairment of $1,605 was recorded during the nine months ended September 30, 2013 since the related assets were sold or recorded at carrying value, which is lower than estimated fair value at September 30, 2013.

Investment_in_Real_Estate_Quan

Investment in Real Estate - Quantitative Information About Level 3 Fair Value Measurements (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified	sqft	Unobservable Inputs (Level 3)
	Property	Contracted Price
		sqft
		Property
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Fair value of industrial property	'	$6,875	[1]
Number of industrial properties	576	1
Gross leasable area (GLA) of industrial properties	55,400,000	500,000
[1]	(A)The fair value for the property was based upon the value of a third party purchase contract, which was subject to our corroboration for reasonableness.

Investments_in_and_Advances_to2

Investments in and Advances to Other Real Estate Partnerships - Condensed Combined Balance Sheets (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'		'
Net Investment in Real Estate	$2,094,507		$2,095,208
Total Assets	2,494,155		2,498,779
Liabilities:	'		'
Mortgage Loans Payable, Net	521,304		580,215
Partners’ Capital	1,102,595		1,180,722
Total Liabilities and Partners’ Capital	2,494,155		2,498,779
Carrying Value of the Operating Partnership’s Investments in Other Real Estate Partnerships	201,935		196,323
Other Real Estate Partnerships	'		'
Assets:	'		'
Net Investment in Real Estate	277,534		276,294
Note Receivable	18,023		119,364
Other Assets, Net	26,862		33,234
Total Assets	322,419		428,892
Liabilities:	'		'
Mortgage Loans Payable, Net	81,623		97,675
Other Liabilities, Net	19,953		13,795
Partners’ Capital	220,843		317,422
Total Liabilities and Partners’ Capital	322,419		428,892
Operating Partnership’s Share of Equity	219,886		316,188
Basis Differentials	-17,951	[1]	-119,865	[1]
Carrying Value of the Operating Partnership’s Investments in Other Real Estate Partnerships	$201,935		$196,323
[1]	This amount represents the aggregate difference between the Operating Partnership’s historical cost basis and the basis reflected at the Other Real Estate Partnerships’ level. The basis differential relates to the elimination of a note receivable and related accrued interest between a Other Real Estate Partnership and wholly owned subsidiaries of the Operating Partnership.

Investments_in_and_Advances_to3

Investments in and Advances to Other Real Estate Partnerships - Condensed Combined Statements of Operations (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]	'	'	'	'
Total Revenues	$76,926	$70,014	$225,910	$210,084
Property Expenses	-24,646	-22,499	-76,077	-68,820
Depreciation and Other Amortization	-25,029	-24,119	-75,237	-71,086
Interest Income	700	611	2,114	1,818
Interest Expense	-16,178	-16,918	-51,522	-51,850
Amortization of Deferred Financing Costs	-716	-736	-2,235	-2,326
Loss from Retirement of Debt	-29	-662	-522	-6,034
Income from Continuing Operations	10,341	4,068	18,186	3,048
Discontinued Operations:	'	'	'	'
Income Attributable to Discontinued Operations	300	836	1,046	1,452
Gain on Sale of Real Estate	11,577	3,613	12,291	14,020
Income from Discontinued Operations	11,877	4,449	13,337	15,472
Gain on Sale of Real Estate	0	221	0	483
Net Income	22,218	8,738	31,523	19,003
Other Real Estate Partnerships	'	'	'	'
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]	'	'	'	'
Total Revenues	10,151	9,694	30,437	28,648
Property Expenses	-2,920	-2,813	-9,319	-8,707
Depreciation and Other Amortization	-3,092	-2,973	-8,843	-8,812
Interest Income	130	1,237	1,192	3,809
Interest Expense	-1,144	-1,079	-3,770	-3,541
Amortization of Deferred Financing Costs	-37	-45	-125	-142
Loss from Retirement of Debt	-3	0	-133	-214
Income from Continuing Operations	3,085	4,021	9,439	11,041
Discontinued Operations:	'	'	'	'
Income Attributable to Discontinued Operations	9	113	56	274
Gain on Sale of Real Estate	1,851	1,630	2,192	1,630
Income from Discontinued Operations	1,860	1,743	2,248	1,904
Gain on Sale of Real Estate	0	70	0	70
Net Income	$4,945	$5,834	$11,687	$13,015

Indebtedness_Information_Regar

Indebtedness - Information Regarding Indebtedness (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]	'		'
Mortgage Loans Payable, Net	$521,304		$580,215
Senior Unsecured Notes, Net	364,837		445,916
Unsecured Term Loan	200,000		0
Unsecured Credit Facility	176,000		173,000
Mortgages	'		'
Debt Instrument [Line Items]	'		'
Mortgage Loans Payable, Net	521,304		580,215
Unamortized Premiums	-96		-115
Mortgage Loans Payable, Gross	521,208		580,100
Interest Rate, Minimum	4.03%		'
Interest Rate, Maximum	8.26%		'
Effective Interest Rate, Minimum	4.03%		'
Effective Interest Rate, Maximum	8.26%		'
Maturity Date Range, Start	1-Feb-16		'
Maturity Date Range, End	1-Sep-22		'
Senior Unsecured Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	364,837		445,916
Unamortized Discounts	265		980
Senior Unsecured Notes, Gross	365,102		446,896
Unsecured Term Loan	'		'
Debt Instrument [Line Items]	'		'
Unsecured Term Loan	200,000	[1]	'
Interest Rate	1.90%	[1]	'
Effective Interest Rate	1.90%	[1]	'
Maturity Date	29-Jan-21	[1]	'
Unsecured Credit Facility	'		'
Debt Instrument [Line Items]	'		'
Unsecured Credit Facility	176,000	[2]	173,000	[2]
Unsecured Credit Facility, Interest Rate at Period End	1.66%	[2]	'
Effective Interest Rate	1.66%	[2]	'
Maturity Date	29-Sep-17	[2]	'
2016 Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	159,607		159,566
Interest Rate	5.75%		'
Effective Interest Rate	5.91%		'
Maturity Date	15-Jan-16		'
2017 Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	54,964		54,960
Interest Rate	7.50%		'
Effective Interest Rate	7.52%		'
Maturity Date	1-Dec-17		'
2027 Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	6,066		6,066
Interest Rate	7.15%		'
Effective Interest Rate	7.11%		'
Maturity Date	15-May-27		'
2028 Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	31,884		31,883
Interest Rate	7.60%		'
Effective Interest Rate	8.13%		'
Maturity Date	15-Jul-28		'
2032 Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	10,517		10,514
Interest Rate	7.75%		'
Effective Interest Rate	7.87%		'
Maturity Date	15-Apr-32		'
2014 Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	0		81,149
Maturity Date	1-Jun-14		'
2017 II Notes	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes, Net	$101,799		$101,778
Interest Rate	5.95%		'
Effective Interest Rate	6.37%		'
Maturity Date	15-May-17		'
[1]	We entered into interest rate protection agreements, with an aggregate notional value of $200,000, to effectively convert the variable rate to a fixed rate. See Note 11.
[2]	The maturity date may be extended an additional year at our election, subject to certain restrictions.

Indebtedness_Additional_Inform

Indebtedness - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended				0 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jan. 29, 2014	Sep. 30, 2014	Jan. 29, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
					Interest Rate Swap	Mortgages	Unsecured Term Loan	Mortgages	Mortgages	Senior Unsecured Notes
Debt Disclosure [Line Items]	'	'	'	'	'	'	'	'	'	'
Extinguishment of debt, amount	'	'	'	'	'	'	'	$59,680	'	$81,794
Gains (losses) on extinguishment of debt	-29	-662	-522	-6,034	'	'	'	'	522	'
Mortgage loan payable assumed	'	'	8,872	'	'	'	'	'	'	'
Carrying value of industrial properties held under mortgage	'	'	'	'	'	667,638	'	'	'	'
Unsecured term loan, term	'	'	'	'	'	'	'7 years	'	'	'
Unsecured term loan, face amount	'	'	'	'	'	'	200,000	'	'	'
Swaps, notional amount	'	'	'	'	$200,000	'	'	'	'	'

Indebtedness_Schedule_of_Matur

Indebtedness - Schedule of Maturities of Long-term Debt (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
Remainder of 2014	$2,544
2015	10,537
2016	250,164
2017	342,927
2018	127,107
Thereafter	529,031
Total	$1,262,310

Indebtedness_Summary_of_Indebt

Indebtedness - Summary of Indebtedness at Estimated Fair Value (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Line Items]	'		'
Mortgage Loans Payable, Net, Carrying Amount	$521,304		$580,215
Senior Unsecured Notes, Net, Carrying Amount	364,837		445,916
Unsecured Term Loan, Carrying Amount	200,000		0
Unsecured Credit Facility, Carrying Amount	176,000		173,000
Total, Carrying Amount	1,262,141		1,199,131
Total, Fair Value	1,331,443		1,241,230
Mortgages	'		'
Debt Disclosure [Line Items]	'		'
Mortgage Loans Payable, Net, Carrying Amount	521,304		580,215
Mortgage Loans Payable, Net, Fair Value	555,933		585,449
Senior Unsecured Notes	'		'
Debt Disclosure [Line Items]	'		'
Senior Unsecured Notes, Net, Carrying Amount	364,837		445,916
Senior Unsecured Notes, Net, Fair Value	398,655		482,781
Unsecured Term Loan	'		'
Debt Disclosure [Line Items]	'		'
Unsecured Term Loan, Carrying Amount	200,000	[1]	'
Unsecured Term Loan, Fair Value	200,597		'
Unsecured Credit Facility	'		'
Debt Disclosure [Line Items]	'		'
Unsecured Credit Facility, Carrying Amount	176,000	[2]	173,000	[2]
Unsecured Credit Facility, Fair Value	$176,258		$173,000
[1]	We entered into interest rate protection agreements, with an aggregate notional value of $200,000, to effectively convert the variable rate to a fixed rate. See Note 11.
[2]	The maturity date may be extended an additional year at our election, subject to certain restrictions.

Partners_Capital_Additional_In

Partners' Capital - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended			9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Mar. 06, 2014	Sep. 30, 2014	Sep. 30, 2014	Mar. 31, 2014
						Series F Preferred Units	Series F Preferred Units	Series F Preferred Units	Series G Preferred Units	Series G Preferred Units
								Minimum
Class of Stock [Line Items]	'	'	'	'	'	'	'	'	'	'
Depositary shares redeemed	'	'	'	'	'	'	50,000	'	'	25,000
Depositary share percentage per share	'	'	'	'	'	'	$0.01	'	'	$0.01
Dividend rate per share	'	'	'	'	'	6.24%	'	'	7.24%	'
Preferred stock, par value per shares	'	'	'	'	'	'	$0.01	'	'	$0.01
Redemption price per share	'	'	'	'	'	'	$1,000	'	'	$1,000
Dividend per share	'	'	'	'	'	$11.33	'	'	$36.18	'
Total dividend	'	'	'	'	'	$566	'	'	$905	'
Cost associated with share redemption	0	2,121	1,462	5,667	'	'	'	'	'	'
Preferred stock shares authorized	10,000,000	'	10,000,000	'	'	'	'	'	'	'
Preferred stock, shares outstanding	0	'	0	'	750	'	'	'	'	'
Units converted into common stock	'	'	175,333	99,508	'	'	'	'	'	'
Conversion of limited partner units to general partner units	'	'	$1,697	$943	'	'	'	'	'	'
Fixed coupon rate of preferred stock	'	'	'	'	'	'	'	2.38%	'	'
Number of years of U.S treasury rate one	'	'	'	'	'	'30 years	'	'	'	'
Number of years of U.S treasury rate two	'	'	'	'	'	'10 years	'	'	'	'
LIBOR rate	'	'	'	'	'	'3-month LIBOR	'	'	'	'
New coupon rate of preferred stock	'	'	'	'	'	6.28%	'	'	'	'

Partners_Capital_Summary_of_Di

Partners' Capital - Summary of Dividend Distributions (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Partners Capital And Distributions [Line Items]	'
General Partner/Limited Partner Units, Total Distribution	$35,416
Total Preferred Dividend/Distribution	2,481
Series F Preferred Units	'
Partners Capital And Distributions [Line Items]	'
Total Preferred Dividend/Distribution	566
Series G Preferred Units	'
Partners Capital And Distributions [Line Items]	'
Total Preferred Dividend/Distribution	$453

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss (Changes in AOCI) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance as of December 31, 2013	($3,362)
Other Comprehensive Loss Before Reclassifications	-3,883
Amounts Reclassified from Accumulated Other Comprehensive Loss	4,129
Net Current Period Other Comprehensive Income (Loss)	246
Balance as of September 30, 2014	-3,116
Interest Rate Protection Agreements	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance as of December 31, 2013	-3,481
Other Comprehensive Loss Before Reclassifications	-3,807
Amounts Reclassified from Accumulated Other Comprehensive Loss	4,129
Net Current Period Other Comprehensive Income (Loss)	322
Balance as of September 30, 2014	-3,159
Foreign Currency Translation Adjustment	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance as of December 31, 2013	119
Other Comprehensive Loss Before Reclassifications	-76
Amounts Reclassified from Accumulated Other Comprehensive Loss	0
Net Current Period Other Comprehensive Income (Loss)	-76
Balance as of September 30, 2014	$43

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss (Amounts Reclassified from AOCI) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Interest Expense	$16,178	$16,918	$51,522	$51,850
Loss from Retirement of Debt	-29	-662	-522	-6,034
Total	-16,223	-17,705	-52,165	-58,340
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Total	1,221	626	4,129	2,908
Interest Rate Contract | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Interest Expense	131	609	1,227	1,792
Loss from Retirement of Debt	0	17	0	1,116
Interest Rate Swap | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Interest Expense	$1,090	$0	$2,902	$0

Accumulated_Other_Comprehensiv4

Accumulated Other Comprehensive Loss - Additional Information (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Accumulated Other Comprehensive Loss [Abstract]	'
Amortization to be reclassified from OCI into income	$523

Supplemental_Information_to_St2

Supplemental Information to Statement of Cash Flows - Cash Flow Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Supplemental Cash Flow Information [Line Items]	'	'
Interest Expense Capitalized in Connection with Development Activity	$1,030	$2,447
Supplemental Schedule of Non-cash Investing and Financing Activities:	'	'
Distributions Payable	11,886	'
Exchange of Limited Partnership Units for General Partnership Units:	'	'
Conversion of Limited Partner Units to General Partner Units	0	0
Assumption of Liabilities in Connection with the Acquisition of Real Estate	269	298
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	21,875	6,369
Mortgage Loan Payable Assumed from Other Real Estate Partnership:	'	'
Transfer Mortgage Payable	0	0
Write-off of Fully Depreciated Assets	-25,896	-36,992
General Partner Units	'	'
Exchange of Limited Partnership Units for General Partnership Units:	'	'
Conversion of Limited Partner Units to General Partner Units	1,697	943
Limited Partner Units	'	'
Exchange of Limited Partnership Units for General Partnership Units:	'	'
Conversion of Limited Partner Units to General Partner Units	-1,697	-943
General and Limited Partner Units	'	'
Supplemental Schedule of Non-cash Investing and Financing Activities:	'	'
Distributions Payable	11,886	9,788
Prepaid Expenses and Other Assets	'	'
Mortgage Loan Payable Assumed from Other Real Estate Partnership:	'	'
Transfer Mortgage Payable	8,872	0
Mortgages	'	'
Mortgage Loan Payable Assumed from Other Real Estate Partnership:	'	'
Transfer Mortgage Payable	($8,872)	$0

Earnings_Per_Unit_Computation_

Earnings Per Unit - Computation of Basic and Diluted Earnings Per Unit (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:	'	'	'	'
Income from Continuing Operations	$10,341	$4,068	$18,186	$3,048
Gain on Sale of Real Estate	0	221	0	483
Income from Continuing Operations Allocable to Participating Securities	-42	-6	-67	0
Preferred Unit Distributions	0	-1,392	-1,019	-7,506
Redemption of Preferred Units	0	-2,121	-1,462	-5,667
Income (Loss) from Continuing Operations Available to Unitholders	10,299	770	15,638	-9,642
Income from Discontinued Operations	11,877	4,449	13,337	15,472
Income from Discontinued Operations Allocable to Participating Securities	-48	-36	-56	-120
Income from Discontinued Operations Attributable to Unitholders	11,829	4,413	13,281	15,352
Net Income Available to Unitholders and Participating Securities	22,218	5,225	29,042	5,830
Net Income Allocable to Participating Securities	90	42	123	120
Net Income Available to Unitholders	$22,128	$5,183	$28,919	$5,710
Denominator:	'	'	'	'
Weighted Average Units - Basic	114,512	114,089	114,346	110,823
LTIP Unit Awards	199	315	442	0
Weighted Average Units - Diluted	114,711	114,404	114,788	110,823
Basic and Diluted EPU:	'	'	'	'
Income (Loss) from Continuing Operations Available to Unitholders	$0.09	$0	$0.14	($0.09)
Income from Discontinued Operations Attributable to Unitholders	$0.10	$0.04	$0.11	$0.14
Net Income Available to Unitholders	$0.19	$0.04	$0.25	$0.05

Earnings_Per_Unit_Additional_I

Earnings Per Unit - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'
Participating securities	463,774	489,381

Stock_Based_Compensation_Addit

Stock Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Compensation expense recognized at date of grant	'	'	$1,451	$1,008
Amortization related to restricted stock and unit awards	1,351	1,769	6,248	4,436
Amortization capitalized in development activities	6	11	36	24
Unrecognized compensation related to unvested restricted stock and unit awards	6,437	'	6,437	'
Weighted average period of unrecognized compensation expected to be recognized	'	'	'10 months 10 days	'
Management | Restricted Stock	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Restricted stock awards to employees	'	'	299,805	'
Unrecognized compensation related to unvested restricted stock and unit awards	5,413	'	5,413	'
Management | Restricted Stock | Minimum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period of restricted stock	'	'	'3 years	'
Director | Restricted Stock	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Restricted stock awards to employees	'	'	19,250	'
Unrecognized compensation related to unvested restricted stock and unit awards	$350	'	$350	'
Director | Restricted Stock | Minimum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period of restricted stock	'	'	'1 year	'

Derivatives_Additional_Informa

Derivatives - Additional Information (Detail) (USD $)	9 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jan. 29, 2014	Sep. 30, 2014	Aug. 01, 2014
	Group I Swaps	Group I Swaps	Group II Swaps	Group II Swaps
Derivative [Line Items]	'	'	'	'
Swaps, number of instruments held	'	4	'	3
Swaps, notional amount	'	$200,000	'	$220,000
Swaps, description of variable rate basis	'1-month LIBOR	'	'3-month LIBOR	'
Swaps, average fixed interest rate	'	2.29%	'	2.58%

Derivatives_Fair_Value_Measure

Derivatives - Fair Value Measurements on Recurring Basis (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Fair Value On Recurring Basis [Line Items]	'
Group II Swaps	$2,237
Group I Swaps	-3,142
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)	'
Fair Value On Recurring Basis [Line Items]	'
Group II Swaps	0
Group I Swaps	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)	'
Fair Value On Recurring Basis [Line Items]	'
Group II Swaps	2,237
Group I Swaps	-3,142
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)	'
Fair Value On Recurring Basis [Line Items]	'
Group II Swaps	0
Group I Swaps	$0

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified	sqft
	Property
Commitments and Contingencies Disclosure [Abstract]	'
Number of industrial properties committed to development	5
Gross leasable area (GLA) of industrial properties committed to development	1,200,000
Estimated total construction costs	$64,700
Estimated total construction costs remaining to be funded	$24,900

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Details) (USD $)	9 Months Ended	1 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Oct. 30, 2014
	Property	Subsequent Event
		Parcels
		Property
Subsequent Event [Line Items]	'	'
Number of industrial properties sold	16	2
Number of land parcels sold	'	1
Proceeds from sale of industrial properties and land parcel	$50,510	$3,285