Life Storage 10-Q 5 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 25, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Trading Symbol	SSS
Entity Registrant Name	SOVRAN SELF STORAGE INC
Entity Central Index Key	944,314
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		46,396,450
Sovran Acquisition Limited Partnership [Member]
Document Information [Line Items]
Entity Registrant Name	Sovran Acquisition Limited Partnership
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment in storage facilities:
Land	$ 626,454	$ 480,176
Building, equipment, and construction in progress	2,295,840	2,011,526
Real estate investment property, at cost, total	2,922,294	2,491,702
Less: accumulated depreciation	(486,521)	(465,195)
Investment in storage facilities, net	2,435,773	2,026,507
Cash and cash equivalents	901,897	7,032
Accounts receivable	4,670	6,805
Receivable from unconsolidated joint ventures	1,045	929
Investment in unconsolidated joint ventures	67,157	62,520
Prepaid expenses	6,446	5,431
Fair value of interest rate swap agreements		550
Other assets	9,465	9,048
Total Assets	3,426,453	2,118,822
Liabilities
Line of credit		79,000
Term notes, net	1,187,770	746,650
Accounts payable and accrued liabilities	37,160	47,839
Deferred revenue	8,075	7,511
Fair value of interest rate swap agreements	22,010	15,343
Mortgages payable	10,205	1,993
Total Liabilities	1,265,220	898,336
Noncontrolling redeemable Operating Partnership Units at redemption value	20,191	18,171
Shareholders' Equity/ Partners' Capital
Common stock $.01 par value, 100,000,000 shares authorized, 46,369,391 shares outstanding at June 30, 2016 (36,710,673 at December 31, 2015)	464	367
Additional paid-in capital	2,339,074	1,388,343
Dividends in excess of net income	(167,901)	(171,980)
Accumulated other comprehensive loss	(30,863)	(14,415)
Total Shareholders' Equity	2,140,774	1,202,315
Noncontrolling interest in consolidated subsidiary	268
Total Equity	2,141,042	1,202,315
Total Liabilities and Shareholders' Equity/ Partners' Capital	3,426,453	2,118,822
Sovran Acquisition Limited Partnership [Member]
Investment in storage facilities:
Land	626,454	480,176
Building, equipment, and construction in progress	2,295,840	2,011,526
Real estate investment property, at cost, total	2,922,294	2,491,702
Less: accumulated depreciation	(486,521)	(465,195)
Investment in storage facilities, net	2,435,773	2,026,507
Cash and cash equivalents	901,897	7,032
Accounts receivable	4,670	6,805
Receivable from unconsolidated joint ventures	1,045	929
Investment in unconsolidated joint ventures	67,157	62,520
Prepaid expenses	6,446	5,431
Fair value of interest rate swap agreements		550
Other assets	9,465	9,048
Total Assets	3,426,453	2,118,822
Liabilities
Line of credit		79,000
Term notes, net	1,187,770	746,650
Accounts payable and accrued liabilities	37,160	47,839
Deferred revenue	8,075	7,511
Fair value of interest rate swap agreements	22,010	15,343
Mortgages payable	10,205	1,993
Total Liabilities	1,265,220	898,336
Limited partners' redeemable capital interest at redemption value (196,008 and 168,866 units outstanding at June 30, 2016 and December 31, 2015, respectively)	20,191	18,171
Shareholders' Equity/ Partners' Capital
General partner (465,654 and 368,795 units outstanding at June 30, 2016 and December 31, 2015, respectively)	21,610	12,205
Limited partners (45,903,738 and 36,341,878 units outstanding at June 30, 2016 and December 31, 2015, respectively)	2,150,027	1,204,525
Accumulated other comprehensive loss	(30,863)	(14,415)
Total Controlling Partners' Capital	2,140,774	1,202,315
Noncontrolling interest in consolidated subsidiary	268
Total Partners' Capital	2,141,042	1,202,315
Total Liabilities and Shareholders' Equity/ Partners' Capital	$ 3,426,453	$ 2,118,822

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	46,369,391	36,710,673
Limited partner, units outstanding	196,008	168,866
Sovran Acquisition Limited Partnership [Member]
General partner, units outstanding	465,654	368,795
Limited partner, units outstanding	45,903,738	36,341,878
Limited Partners Redeemable Capital Interest at Redemption Value [Member] | Sovran Acquisition Limited Partnership [Member]
Limited partner, units outstanding	196,008	168,866

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Rental income	$ 98,795	$ 83,487	$ 190,337	$ 162,373
Other operating income	8,210	7,239	15,792	13,761
Total operating revenues	107,005	90,726	206,129	176,134
Expenses
Property operations and maintenance	23,153	19,486	46,014	40,046
Real estate taxes	11,021	9,145	21,568	18,064
General and administrative	10,114	9,686	20,578	19,092
Acquisition costs	1,694	788	4,078	1,369
Operating leases of storage facilities				683
Depreciation and amortization	18,251	14,584	34,676	28,766
Total operating expenses	64,233	53,689	126,914	108,020
Income from operations	42,772	37,037	79,215	68,114
Other income (expenses)
Interest expense	(8,244)	(9,216)	(17,377)	(18,377)
Interest expense - bridge financing commitment fee	(7,329)		(7,329)
Interest income	37	2	43	4
Gain (loss) on sale of storage facilities	15,270		15,270	(7)
Equity in income of joint ventures	998	853	1,913	1,499
Net income	43,504	28,676	71,735	51,233
Net income attributable to noncontrolling interest in the Operating Partnership	(208)	(144)	(338)	(250)
Net loss attributable to noncontrolling interest in consolidated subsidiary	160		399
Net income attributable to common shareholders/unitholders	$ 43,456	$ 28,532	$ 71,796	$ 50,983
Earnings per common share/unit attributable to common shareholders/unitholders - basic	$ 1.04	$ 0.81	$ 1.79	$ 1.46
Earnings per common share/unit attributable to common shareholders/unitholders - diluted	$ 1.03	$ 0.80	$ 1.78	$ 1.45
Common shares/units used in basic earnings per share calculation	41,980,389	35,377,694	40,195,603	34,853,731
Common shares/units used in diluted earnings per share calculation	42,227,388	35,603,020	40,445,263	35,078,946
Dividends/Distributions declared per common share/unit	$ 0.95	$ 0.75	$ 1.80	$ 1.50
Sovran Acquisition Limited Partnership [Member]
Revenues
Rental income	$ 98,795	$ 83,487	$ 190,337	$ 162,373
Other operating income	8,210	7,239	15,792	13,761
Total operating revenues	107,005	90,726	206,129	176,134
Expenses
Property operations and maintenance	23,153	19,486	46,014	40,046
Real estate taxes	11,021	9,145	21,568	18,064
General and administrative	10,114	9,686	20,578	19,092
Acquisition costs	1,694	788	4,078	1,369
Operating leases of storage facilities				683
Depreciation and amortization	18,251	14,584	34,676	28,766
Total operating expenses	64,233	53,689	126,914	108,020
Income from operations	42,772	37,037	79,215	68,114
Other income (expenses)
Interest expense	(8,244)	(9,216)	(17,377)	(18,377)
Interest expense - bridge financing commitment fee	(7,329)		(7,329)
Interest income	37	2	43	4
Gain (loss) on sale of storage facilities	15,270		15,270	(7)
Equity in income of joint ventures	998	853	1,913	1,499
Net income	43,504	28,676	71,735	51,233
Net income attributable to noncontrolling interest in the Operating Partnership	(208)	(144)	(338)	(250)
Net loss attributable to noncontrolling interest in consolidated subsidiary	160		399
Net income attributable to common shareholders/unitholders	$ 43,456	$ 28,532	$ 71,796	$ 50,983
Earnings per common share/unit attributable to common shareholders/unitholders - basic	$ 1.04	$ 0.81	$ 1.79	$ 1.46
Earnings per common share/unit attributable to common shareholders/unitholders - diluted	$ 1.03	$ 0.80	$ 1.78	$ 1.45
Common shares/units used in basic earnings per share calculation	41,980,389	35,377,694	40,195,603	34,853,731
Common shares/units used in diluted earnings per share calculation	42,227,388	35,603,020	40,445,263	35,078,946
Dividends/Distributions declared per common share/unit	$ 0.95	$ 0.75	$ 1.80	$ 1.50
Net income attributable to general partner	$ 437	$ 287	$ 721	$ 512
Net income attributable to limited partners	$ 43,019	$ 28,245	$ 71,075	$ 50,471

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 43,504	$ 28,676	$ 71,735	$ 51,233
Other comprehensive income:
Change in fair value of derivatives net of reclassification to interest expense	(4,352)	2,421	(16,448)	(1,566)
Total comprehensive income	39,152	31,097	55,287	49,667
Comprehensive income attributable to noncontrolling interest in the Operating Partnership	(187)	(156)	(261)	(242)
Comprehensive loss attributable to noncontrolling interest in consolidated subsidiary	160		399
Comprehensive income attributable to common shareholders/ unitholders	39,125	30,941	55,425	49,425
Sovran Acquisition Limited Partnership [Member]
Net income	43,504	28,676	71,735	51,233
Other comprehensive income:
Change in fair value of derivatives net of reclassification to interest expense	(4,352)	2,421	(16,448)	(1,566)
Total comprehensive income	39,152	31,097	55,287	49,667
Comprehensive income attributable to noncontrolling interest in the Operating Partnership	(187)	(156)	(261)	(242)
Comprehensive loss attributable to noncontrolling interest in consolidated subsidiary	160		399
Comprehensive income attributable to common shareholders/ unitholders	$ 39,125	$ 30,941	$ 55,425	$ 49,425

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities
Net income	$ 71,735	$ 51,233
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34,676	28,766
Amortization of debt issuance costs	8,035	592
(Gain) loss on sale of storage facilities	(15,270)	7
Equity in income of joint ventures	(1,913)	(1,499)
Distributions from unconsolidated joint ventures	2,548	1,978
Non-vested stock earned	3,802	3,208
Stock option expense	81	117
Changes in assets and liabilities (excluding the effects of acquisitions):
Accounts receivable	2,193	(404)
Prepaid expenses	(841)	793
Advances to joint ventures	(116)	(228)
Accounts payable and other liabilities	(11,086)	(3,929)
Deferred revenue	(915)	86
Net cash provided by operating activities	92,929	80,720
Investing Activities
Acquisitions of storage facilities	(415,749)	(208,453)
Improvements, equipment additions, and construction in progress	(27,626)	(12,296)
Net proceeds from the sale of storage facilities	34,074	711
Investment in unconsolidated joint ventures	(5,335)	(483)
Property deposit	(829)	(1,493)
Net cash used in investing activities	(415,465)	(222,014)
Financing Activities
Net proceeds from sale of common stock/partnership units	942,150	144,966
Proceeds from line of credit	577,000	219,000
Repayments of line of credit	(656,000)	(172,000)
Proceeds from senior term note, net of discount	596,682
Repayment of term note	(150,000)
Debt issuance costs	(14,183)
Settlement of forward starting interest rate swaps	(9,167)
Dividends paid-common stock	(68,637)	(52,281)
Distributions to noncontrolling interest holders	(370)	(251)
Mortgage principal payments	(74)	(66)
Net cash provided by financing activities	1,217,401	139,368
Net increase (decrease) in cash	894,865	(1,926)
Cash at beginning of period	7,032	8,543
Cash at end of period	901,897	6,617
Supplemental cash flow information
Cash paid for interest, net of interest capitalized	25,170	17,896
Cash paid for income taxes, net of refunds	970	943
Sovran Acquisition Limited Partnership [Member]
Operating Activities
Net income	71,735	51,233
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34,676	28,766
Amortization of debt issuance costs	8,035	592
(Gain) loss on sale of storage facilities	(15,270)	7
Equity in income of joint ventures	(1,913)	(1,499)
Distributions from unconsolidated joint ventures	2,548	1,978
Non-vested stock earned	3,802	3,208
Stock option expense	81	117
Changes in assets and liabilities (excluding the effects of acquisitions):
Accounts receivable	2,193	(404)
Prepaid expenses	(841)	793
Advances to joint ventures	(116)	(228)
Accounts payable and other liabilities	(11,086)	(3,929)
Deferred revenue	(915)	86
Net cash provided by operating activities	92,929	80,720
Investing Activities
Acquisitions of storage facilities	(415,749)	(208,453)
Improvements, equipment additions, and construction in progress	(27,626)	(12,296)
Net proceeds from the sale of storage facilities	34,074	711
Investment in unconsolidated joint ventures	(5,335)	(483)
Property deposit	(829)	(1,493)
Net cash used in investing activities	(415,465)	(222,014)
Financing Activities
Net proceeds from sale of common stock/partnership units	942,150	144,966
Proceeds from line of credit	577,000	219,000
Repayments of line of credit	(656,000)	(172,000)
Proceeds from senior term note, net of discount	596,682
Repayment of term note	(150,000)
Debt issuance costs	(14,183)
Settlement of forward starting interest rate swaps	(9,167)
Distributions to unitholders	(68,637)	(52,281)
Distributions to noncontrolling interest holders	(370)	(251)
Mortgage principal payments	(74)	(66)
Net cash provided by financing activities	1,217,401	139,368
Net increase (decrease) in cash	894,865	(1,926)
Cash at beginning of period	7,032	8,543
Cash at end of period	901,897	6,617
Supplemental cash flow information
Cash paid for interest, net of interest capitalized	25,170	17,896
Cash paid for income taxes, net of refunds	$ 970	$ 943

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	1. BASIS OF PRESENTATION The accompanying unaudited financial statements of Sovran Self Storage, Inc. and Sovran Acquisition Limited Partnership have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the six month period ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016. Reclassification:

Organization

Organization	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	2. ORGANIZATION Sovran Self Storage, Inc. (the “Parent Company”) operates as a self-administered and self-managed real estate investment trust (a “REIT”) that owns and operates self-storage facilities throughout the United States. All of the Parent Company’s assets are owned by, and all its operations are conducted through, Sovran Acquisition Limited Partnership (the “Operating Partnership”). Sovran Holdings, Inc., a wholly-owned subsidiary of the Parent Company (“Holdings”), is the sole general partner of the Operating Partnership; the Parent Company is a limited partner of the Operating Partnership, and through its ownership of Holdings and its limited partnership interest controls the operations of the Operating Partnership, holding a 99.6% ownership interest therein as of June 30, 2016. The remaining ownership interests in the Operating Partnership (the “Units”) are held by certain former owners of assets acquired by the Operating Partnership. The Parent Company, the Operating Partnership and their consolidated subsidiaries are collectively referred to in this report as the “Company.” In addition, terms such as “we,” “us,” or “our” used in this report may refer to the Company, the Parent Company and/or the Operating Partnership. At June 30, 2016, we had an ownership interest in, and/or managed 563 self-storage properties in 26 states under the name Uncle Bob’s Self Storage ® We consolidate all wholly owned subsidiaries. Partially owned subsidiaries and joint ventures are consolidated when we control the entity. Our consolidated financial statements include the accounts of the Parent Company, the Operating Partnership, Uncle Bob’s Management, LLC (the Parent Company’s taxable REIT subsidiary), Warehouse Anywhere LLC (an entity owned 60% by Uncle Bob’s Management, LLC), Locke Sovran I, LLC (a wholly-owned subsidiary), and Locke Sovran II, LLC (a wholly-owned subsidiary). All intercompany transactions and balances have been eliminated. Investments in joint ventures that we do not control but for which we have significant influence over are accounted for using the equity method. Included in the Parent Company’s consolidated balance sheets are noncontrolling redeemable operating partnership units and included in the Operating Partnership’s consolidated balance sheets are limited partners’ redeemable capital interest at redemption value. These interests are presented in the “mezzanine” section of the consolidated balance sheet because they do not meet the functional definition of a liability or equity under current accounting literature. These represent the outside ownership interests of the limited partners in the Operating Partnership. At June 30, 2016, there were 196,008 noncontrolling redeemable operating partnership Units outstanding (168,866 at December 31, 2015). These unitholders are entitled to receive distributions per unit equivalent to the dividends declared per share on the Parent Company’s common stock. The Operating Partnership is obligated to redeem each of these limited partnership Units in the Operating Partnership at the request of the holder thereof for cash equal to the fair market value of a share of the Parent Company’s common stock, at the time of such redemption, provided that the Company at its option may elect to acquire any such Unit presented for redemption for one common share or cash. The Company accounts for these noncontrolling redeemable Operating Partnership Units under the provisions of EITF D-98, “ Classification and Measurement of Redeemable Securities The following is a reconciliation of the Parent Company’s noncontrolling interests for the period: (dollars in thousands) Six Months Beginning balance noncontrolling redeemable Operating Partnership Units $ 18,171 Issuance of Operating Partnership Units 7,767 Redemption of Operating Partnership Units (4,795 ) Net income attributable to noncontrolling interest in the Operating Partnership 338 Distributions (370 ) Adjustment to redemption value (920 ) Ending balance noncontrolling redeemable Operating Partnership Units $ 20,191 The following is a reconciliation of the Operating Partnership’s noncontrolling interests for the period: (dollars in thousands) Six Months Beginning balance Limited Partners’ Redeemable Capital Interest $ 18,171 Issuance of Limited Partners’ Redeemable Capital Interest Units 7,767 Redemption of Limited Partners’ Redeemable Capital Interest Units (4,795 ) Net income attributable to Limited Partners’ Redeemable Capital Interest 338 Distributions (370 ) Adjustment to redemption value (920 ) Ending balance Limited Partners’ Redeemable Capital Interest $ 20,191 In 2016 the Operating Partnership issued 69,005 Units with a fair market value of $7.8 million to acquire self-storage properties. The fair value of the Units on the date of issuance was determined based upon the fair market value of the Parent Company’s common stock on that date.

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	3. STOCK BASED COMPENSATION The Company accounts for stock-based compensation under the provisions of ASC Topic 718, “ Compensation—Stock Compensation For the three months ended June 30, 2016 and 2015, the Company recorded compensation expense (included in general and administrative expense) of $35,000 and $81,000, respectively, related to stock options and $1,891,000 and $1,579,000, respectively, related to amortization of non-vested stock grants and performance-based awards. For the six months ended June 30, 2016 and 2015, the Company recorded compensation expense of $81,000 and $117,000, respectively, related to stock options and $3,757,000 and $3,191,000, respectively, related to amortization of non-vested stock grants and performance-based awards. During the three months ended June 30, 2016 and 2015, employees and directors exercised 0 and 5,500 stock options respectively, and 3,696 and 5,995 shares of non-vested stock, respectively, vested. During the six months ended June 30, 2016 and 2015, employees and directors exercised 0 and 15,000 stock options respectively, and 10,881 and 11,229 shares of non-vested stock, respectively, vested.

Investment in Storage Facilitie

Investment in Storage Facilities	6 Months Ended
	Jun. 30, 2016
Real Estate [Abstract]
Investment in Storage Facilities	4. INVESTMENT IN STORAGE FACILITIES The following summarizes our activity in storage facilities during the six months ended June 30, 2016. (dollars in thousands) Cost: Beginning balance $ 2,491,702 Acquisition of storage facilities 431,460 Improvements and equipment additions 13,624 Additions to consolidated subsidiary 2,117 Net increase in construction in progress 12,724 Dispositions (29,333 ) Ending balance $ 2,922,294 Accumulated Depreciation: Beginning balance $ 465,195 Additions during the period 31,674 Dispositions (10,348 ) Ending balance $ 486,521 The Company acquired 34 facilities during the six months ended June 30, 2016. The acquisition of one store that was acquired at certificate of occupancy was accounted for as an asset acquisition. The cost of this store, including closing costs, was assigned to its land, building, equipment and improvements components based upon their relative fair values. The assets and liabilities of the other 33 storage facilities acquired in 2016, which primarily consist of tangible and intangible assets, are measured at fair value on the date of acquisition in accordance with the principles of FASB ASC Topic 820, “ Fair Value Measurements and Disclosures” (dollars in thousands) Consideration paid Acquisition Date Fair Value State Number Date of Purchase Cash Value of Mortgage Net Other Land Building, In-Place Closing Florida 4 1/6/2016 $ 20,350 $ 20,246 $ — $ — $ 104 $ 6,646 $ 13,339 $ 365 $ 372 California 4 1/21/2016 78,750 78,562 — — 188 27,876 49,860 1,014 332 New Hampshire 5 1/21/2016 54,225 53,941 — — 284 12,902 40,428 895 576 Massachusetts 1 1/21/2016 11,375 11,350 — — 25 4,874 6,335 166 65 Texas 3 1/21/2016 42,050 41,894 — — 156 23,487 18,000 563 251 Arizona 1 2/1/2016 9,275 9,261 — — 14 988 8,224 63 120 Florida 1 2/12/2016 11,274 11,270 — — 4 2,294 8,980 — — Pennsylvania 1 2/17/2016 5,750 5,732 — — 18 1,768 3,879 103 148 Colorado 1 2/29/2016 12,600 12,549 — — 51 4,528 7,915 157 172 California 3 3/16/2016 68,832 63,965 4,472 — 395 22,647 45,371 814 265 California 1 3/17/2016 17,320 17,278 — — 42 6,728 10,339 253 116 California 1 4/11/2016 36,750 33,346 3,295 — 109 17,445 18,840 465 125 Connecticut 2 4/14/2016 17,313 17,152 — — 161 6,142 10,904 267 172 New York 2 4/26/2016 24,312 20,143 — 4,249 (80 ) 5,710 18,201 401 340 Florida 1 5/2/2016 8,100 4,006 — 4,036 58 3,018 4,922 160 144 Texas 1 5/5/2016 10,800 10,708 — — 92 2,333 8,302 165 117 New York 2 5/19/2016 8,400 8,366 — — 34 714 7,521 165 180 Total acquired 34 $ 437,476 $ 419,769 $ 7,767 $ 8,285 $ 1,655 $ 150,100 $ 281,360 $ 6,016 $ 3,495 All of the properties acquired were purchased from unrelated third parties. The operating results of the facilities acquired have been included in the Company’s operations since the respective acquisition dates. Of the $419.8 million paid at closing for the properties acquired during 2016, $4.0 million represented deposits that were paid in 2015 when certain of these properties originally went under contract. In addition to the closing costs expensed on 2016 acquisitions, the Company also incurred $0.6 million of acquisition costs during the six months ended June 30, 2016 related to facilities acquired in July of 2016, including the acquisition of LifeStorage, LP (See Note 16). Non-cash investing activities during 2016 include the issuance of $7.8 million in Operating Partnership Units, the assumption of two mortgages with outstanding balances of $8.3 million, and the assumption of net other liabilities of $1.7 million. The Company measures the fair value of in-place customer lease intangible assets based on the Company’s experience with customer turnover. The Company amortizes in-place customer leases on a straight-line basis over 12 months (the estimated future benefit period). In-place customer leases are included in other assets on the Company’s consolidated balance sheets as follows: (Dollars in thousands) Jun. 30, Dec. 31, In-place customer leases $ 28,237 $ 22,320 Accumulated amortization (23,912 ) (21,017 ) Net carrying value at the end of period $ 4,325 $ 1,303 Amortization expense related to in-place customer leases was $1.8 million and $1.0 million for the three months ended June 30, 2016 and 2015, respectively and was $3.0 million and $2.0 million for the six months ended June 30, 2016 and 2015, respectively. The Company expects to record $6.3 million and $1.0 million of amortization expense for the years ended December 31, 2016 and 2017, respectively. During the six months ended June 30, 2016, the Company acquired 34 properties. On July 15, 2016, the Company acquired LifeStorage, LP (See Note 16). The following pro forma information is based on the combined historical financial statements of the Company, the 34 properties acquired during the six months ended June 30, 2016, and LifeStorage, LP as if the acquisitions had all occurred as of January 1, 2015. (Dollars in thousands, except per share data) Three Three Six Six Total revenues $ 128,494 $ 113,999 $ 251,813 $ 221,356 Net income attributable to common shareholders $ 53,890 $ 12,771 $ 84,239 $ 18,490 Earnings per common share Basic $ 1.17 $ 0.28 $ 1.83 $ 0.40 Diluted $ 1.16 $ 0.28 $ 1.82 $ 0.40 The above pro forma information includes the results of eight stores acquired by LifeStorage, LP in 2016 and 17 stores acquired by LifeStorage, LP in 2015. These stores therefore were not owned for the entire pro forma periods. The above pro forma information also includes increases in amortization of in-place customer leases totaling $13.2 million and $26.5 million for the three and six month periods ending June 30, 2015, respectively. As noted above, in-place customer leases are amortized over their estimated future benefit period of 12 months. Material, nonrecurring pro forma adjustments directly attributable to the business combinations and included in the above pro forma financial information include reductions to interest expense related to acquisition bridge financing totaling $7.3 million for the three and six months ended June 30, 2016 and reductions to acquisition costs totaling $1.7 million and $4.1 million for the three and six months ended June 30, 2016, respectively. The following table summarizes the revenues and earnings since the acquisition dates that are included in the Company’s consolidated statements of operations for the six months ended June 30, 2016 related to the 34 properties acquired during the three and six months ended June 30, 2016. (Dollars in thousands) Three Months Six Months Total revenues $ 7,967 $ 11,720 Net loss attributable to common shareholders $ (376 ) $ (2,275 ) The above net losses attributable to common shareholders were primarily due to the acquisition costs incurred in connection with the 2016 acquisitions. Property Dispositions During 2016 the Company sold eight non-strategic properties with a carrying value of $18.8 million and received cash proceeds of $34.1 million, resulting in a $15.3 million gain on sale. During 2015 the Company sold three non-strategic properties purchased in 2014 and 2015 with a carrying value of $5.1 million and received cash proceeds of $4.6 million, resulting in a $0.5 million loss on sale. The following table summarizes the revenues and expenses up to the dates of sale of the 11 properties sold in 2016 and 2015 that are included in the Company’s consolidated statements of operations for 2016 and 2015. (Dollars in thousands) Three Months Three Months Six Months Six Months Total operating revenues $ 1,171 $ 1,140 $ 2,324 $ 2,258 Property operations and maintenance expense (299 ) (321 ) (614 ) (644 ) Real estate tax expense (25 ) (69 ) (98 ) (138 ) Depreciation and amortization expense (179 ) (174 ) (359 ) (350 ) Gain (loss) on sale of storage facilities 15,270 — 15,270 (7 ) $ 15,938 $ 576 $ 16,523 $ 1,119

Unsecured Line of Credit and Te

Unsecured Line of Credit and Term Notes	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Unsecured Line of Credit and Term Notes	5. UNSECURED LINE OF CREDIT AND TERM NOTES Borrowings outstanding on our unsecured line of credit and term notes are as follows: (Dollars in thousands) Jun. 30, Dec. 31, Revolving line of credit borrowings $ — $ 79,000 Term note due April 26, 2016 — 150,000 Term note due June 4, 2020 325,000 325,000 Term note due August 5, 2021 100,000 100,000 Term note due April 8, 2024 175,000 175,000 Senior term note due July 1, 2026 600,000 — Total principal balance outstanding 1,200,000 750,000 Less: unamortized debt issuance costs (8,912 ) (3,350 ) Less: unamortized senior term note discount (3,318 ) — Term notes payable $ 1,187,770 $ 746,650 In January 2016, the Company exercised the expansion feature on its existing amended unsecured credit agreement and increased the revolving credit limit from $300 million to $500 million. The interest rate on the revolving credit facility bears interest at a variable annual rate equal to LIBOR plus a margin based on the Company’s credit rating (at June 30, 2016 the margin is 1.10%), and requires an annual 0.15% facility fee. The amended agreement also reduced the interest rate on the $325 million unsecured term note issued under this credit agreement maturing June 4, 2020, with the term note bearing interest at LIBOR plus a margin based on the Company’s credit rating (at June 30, 2016 the margin is 1.15%). The interest rate at June 30, 2016 on the Company’s line of credit was approximately 1.54% (1.72% at December 31, 2015). At June 30, 2016, there was $500 million available on the unsecured line of credit. The revolving line of credit has a maturity date of December 10, 2019. On April 8, 2014, the Company entered into a $175 million term note maturing April 2024 bearing interest at a fixed rate of 4.533%. The interest rate on the term note increases to 6.283% if the Company is not rated by at least one rating agency or if the Company’s credit rating is downgraded. The proceeds from this term note were used to repay the $115 million outstanding on the Company’s line of credit at April 8, 2014, with the excess proceeds used for acquisitions. In 2011, the Company entered into a $100 million term note maturing August 5, 2021 bearing interest at a fixed rate of 5.54%. The interest rate on the term note increases to 7.29% if the notes are not rated by at least one rating agency, the credit rating on the notes is downgraded or if the Company’s credit rating is downgraded. The proceeds from this term note were used to fund acquisitions and investments in unconsolidated joint ventures. The Company has maintained a $150 million unsecured term note maturing April 26, 2016 bearing interest at 6.38%. The Company used a draw on the line of credit to pay off the balance of this note on April 26, 2016. The line of credit and term notes require the Company to meet certain financial covenants, measured on a quarterly basis, including prescribed leverage, fixed charge coverage, minimum net worth, limitations on additional indebtedness and limitations on dividend payouts. At June 30, 2016, the Company was in compliance with its debt covenants. We believe that if operating results remain consistent with historical levels and levels of other debt and liabilities remain consistent with amounts outstanding at June 30, 2016 the entire availability on the line of credit could be drawn without violating our debt covenants. On May 17, 2016, the Company entered into two senior unsecured acquisition bridge facilities (the “Bridge Facilities”) totaling $1,675 million with the Company’s third-party advisors to the LifeStorage, LP acquisition (see Note 16). In consideration for the bridge financing commitments, the Company paid fees totaling $7.3 million which are included as interest expense – acquisition bridge loan commitment fee in the consolidated statements of operations for the three and six month periods ending June 30, 2016. The Bridge Facilities commitments were terminated on June 29, 2016. On June 20, 2016, the Operating Partnership issued $600 million in aggregate principal amount of 3.50% unsecured senior notes due July 1, 2026 (the “2026 Senior Notes”). The 2026 Senior Notes were issued at a 0.553% discount to par value. Interest on the 2026 Senior Notes is payable semi-annually in arrears on January 1 and July 1, beginning on January 1, 2017. The 2026 Senior Notes are fully and unconditionally guaranteed by the Parent Company. Proceeds received upon issuance, net of discount to par of $3.3 million and underwriting discount and other offering expenses of $5.5 million, totaled $591.2 million. The indenture under which the 2026 Senior Notes were issued restricts the ability of the Company and its subsidiaries to incur debt unless the Company and its consolidated subsidiaries comply with a leverage ratio not to exceed 60% and an interest coverage ratio of more than 1.5:1 on all outstanding debt, after giving effect to the incurrence of the debt. The indenture also restricts the ability of the Company and its subsidiaries to incur secured debt unless the Company and its consolidated subsidiaries comply with a secured debt leverage ratio not to exceed 40% after giving effect to the incurrence of the debt. The indenture also contains other financial and customary covenants, including a covenant not to own unencumbered assets with a value less than 150% of the unsecured indebtedness of the Company and its consolidated subsidiaries. As of June 30, 2016, the Company was in compliance with all of the financial covenants under the 2026 Senior Notes. During April 2015, the FASB issued ASU No. 2015-03, Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which amends the requirements for the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU No. 2015-03 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. Consistent with the guidance in ASU No. 2015-03 there are $3.4 million of debt issuance costs that have been presented as a reduction of term notes in our accompanying consolidated balance sheets at December 31, 2015 that were previously classified in other assets prior to the adoption of ASU No. 2015-03. The implementation of this accounting standards update had no effect on our results of operations or cash flows. In August 2015, the FASB issued Accounting Standards Update 2015-15, “Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements” (“ASU 2015-15”). ASU 2015-15 codifies an SEC staff announcement that entities are permitted to defer and present debt issuance costs related to line-of-credit arrangements as assets. ASU No. 2015-15 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. The implementation of this update did not result in any changes to our consolidated financial statements. The Company’s fixed rate term notes contain a provision that allows for the noteholders to call the debt upon a change of control of the Company at an amount that includes a make whole premium based on rates in effect on the date of the change of control. At this time no change in control is planned or anticipated.

Mortgages Payable and Debt Matu

Mortgages Payable and Debt Maturities	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Mortgages Payable and Debt Maturities	6. MORTGAGES PAYABLE AND DEBT MATURITIES Mortgages payable at June 30, 2016 and December 31, 2015 consist of the following: (dollars in thousands) June 30, December 31, 4.065% mortgage note due April 1, 2023, secured by one self-storage facility with an aggregate net book value of $7.6 million, principal and interest paid monthly (effective interest rate 4.29%) 4,249 — 5.26% mortgage note due November 1, 2023, secured by one self-storage facility with an aggregate net book value of $8.2 million, principal and interest paid monthly (effective interest rate 5.58%) 4,033 — 5.99% mortgage note due May 1, 2026, secured by one self-storage facility with an aggregate net book value of $4.3 million, principal and interest paid monthly (effective interest rate 6.24%) 1,923 1,993 Total mortgages payable $ 10,205 $ 1,993 The table below summarizes the Company’s debt obligations and interest rate derivatives at June 30, 2016. The estimated fair value of financial instruments is subjective in nature and is dependent on a number of important assumptions, including discount rates and relevant comparable market information associated with each financial instrument. The fair value of the fixed rate term notes and mortgage notes were estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. These assumptions are considered Level 2 inputs within the fair value hierarchy as described in Note 8. The carrying values of our variable rate debt instruments approximate their fair values as these debt instruments bear interest at current market rates that approximate market participant rates. This is considered a Level 2 input within the fair value hierarchy. The use of different market assumptions and estimation methodologies may have a material effect on the reported estimated fair value amounts. Accordingly, the estimates presented below are not necessarily indicative of the amounts the Company would realize in a current market exchange. Expected Maturity Date Including Discount (dollars in thousands) 2016 2017 2018 2019 2020 Thereafter Total Fair Line of credit - variable rate LIBOR + 1.10% — — — — — — — — Notes Payable: Term note - variable rate LIBOR+1.15% — — — — $ 325,000 — $ 325,000 $ 325,000 Term note - fixed rate 5.54% — — — — — $ 100,000 $ 100,000 $ 114,096 Term note - fixed rate 4.533% — — — — — $ 175,000 $ 175,000 $ 190,191 Term note - fixed rate 3.50% — — — — — $ 600,000 $ 600,000 $ 606,553 Mortgage note - fixed rate 4.065% $ 42 $ 88 $ 92 $ 96 $ 99 $ 3,832 $ 4,249 $ 4,255 Mortgage note - fixed rate 5.26% $ 30 $ 63 $ 67 $ 71 $ 74 $ 3,728 $ 4,033 $ 4,332 Mortgage note - fixed rate 5.99% $ 71 $ 151 $ 160 $ 170 $ 181 $ 1,190 $ 1,923 $ 2,083 Interest rate derivatives – liability — — — — — — — $ 22,010

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	7. DERIVATIVE FINANCIAL INSTRUMENTS Interest rate swaps are used to adjust the proportion of total debt that is subject to variable interest rates. The interest rate swaps require the Company to pay an amount equal to a specific fixed rate of interest times a notional principal amount and to receive in return an amount equal to a variable rate of interest times the same notional amount. The notional amounts are not exchanged. Forward starting interest rate swaps are also used by the Company to hedge the risk of changes in the interest-related cash outflows associated with the potential issuance of long-term debt. No other cash payments are made unless the contract is terminated prior to its maturity, in which case the contract would likely be settled for an amount equal to its fair value. The Company enters into interest rate swaps with a number of major financial institutions to minimize counterparty credit risk. The interest rate swaps qualify and are designated as hedges of the amount of future cash flows related to interest payments on variable rate debt. Therefore, the interest rate swaps are recorded in the consolidated balance sheet at fair value and the related gains or losses are deferred in shareholders’ equity or partners’ capital as Accumulated Other Comprehensive Loss (“AOCL”). These deferred gains and losses are recognized in interest expense during the period or periods in which the related interest payments affect earnings. However, to the extent that the interest rate swaps are not perfectly effective in offsetting the change in value of the interest payments being hedged, the ineffective portion of these contracts is recognized in earnings immediately. Ineffectiveness was de minimis for the three and six months ended June 30, 2016, and 2015. The Company has interest rate swap agreements in effect at June 30, 2016 as detailed below to effectively convert a total of $325 million of variable-rate debt to fixed-rate debt. Notional Amount Effective Date Expiration Date Fixed Floating Rate $125 Million 9/1/2011 8/1/18 2.3700 % 1 month LIBOR $100 Million 12/30/11 12/29/17 1.6125 % 1 month LIBOR $100 Million 9/4/13 9/4/18 1.3710 % 1 month LIBOR $100 Million 12/29/17 11/29/19 3.9680 % 1 month LIBOR $125 Million 8/1/18 6/1/20 4.1930 % 1 month LIBOR In the fourth quarter of 2015, the Company entered into forward starting interest rate swap agreements with a total notional value of $50 million. In the first quarter of 2016, the Company entered into additional forward starting interest rate swap agreements with a total notional value of $100 million. These forward starting interest rate swap agreements were entered into to hedge the risk of changes in the interest-related cash flows associated with the potential issuance of fixed rate long-term debt. In conjunction with the issuance of the $600 million 2026 Senior Notes (see Note 5), the Company settled the forward starting swap agreements for a loss of approximately $9.2 million. The loss was recorded as accumulated other comprehensive loss and is being amortized as additional interest expense over the ten-year term of the $600 million 2026 Senior Notes. Consistent with the Company’s accounting policy, the cash outflow related to the settlement of the forward starting swap agreements is reflected as a financing activity in the consolidated statements of cash flows. The interest rate swap agreements are the only derivative instruments, as defined by FASB ASC Topic 815 “ Derivatives and Hedging The Company’s agreements with its interest rate swap counterparties contain provisions pursuant to which the Company could be declared in default of its derivative obligations if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender. The interest rate swap agreements also incorporate other loan covenants of the Company. Failure to comply with the loan covenant provisions would result in the Company being in default on the interest rate swap agreements. As of June 30, 2016, the Company had not posted any collateral related to the interest rate swap agreements. If the Company had breached any of these provisions as of June 30, 2016, it could have been required to settle its obligations under the agreements at their net termination cost of $22.0 million. The changes in AOCL for the three and six months ended June 30, 2016 and June 30, 2015 are summarized as follows: (dollars in thousands) Apr. 1, 2016 Apr. 1, 2015 Jan. 1, 2016 Jan. 1, 2015 Accumulated other comprehensive loss beginning of period $ (26,511 ) $ (16,992 ) $ (14,415 ) $ (13,005 ) Realized loss reclassified from accumulated other comprehensive loss to interest expense 1,160 1,359 2,357 2,718 Unrealized loss from changes in the fair value of the effective portion of the interest rate swaps (5,512 ) 1,062 (18,805 ) (4,284 ) Loss included in other comprehensive loss (4,352 ) 2,421 (16,448 ) (1,566 ) Accumulated other comprehensive loss end of period $ (30,863 ) $ (14,571 ) $ (30,863 ) $ (14,571 )

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. FAIR VALUE MEASUREMENTS The Company applies the provisions of ASC Topic 820 “ Fair Value Measurements and Disclosures Refer to Note 6 for presentation of the fair values of debt obligations which are disclosed at fair value on a recurring basis. The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2016 and December 31, 2015 (in thousands): Asset Level 1 Level 2 Level 3 June 30, 2016 Interest rate swaps $ (22,010 ) — $ (22,010 ) — December 31, 2015 Interest rate swaps $ 550 — $ 550 — Interest rate swaps $ (15,343 ) — $ (15,343 ) — Interest rate swaps are over the counter securities with no quoted readily available Level 1 inputs, and therefore are measured at fair value using inputs that are directly observable in active markets and are classified within Level 2 of the valuation hierarchy, using the income approach. During 2016, assets and liabilities measured at fair value on a non-recurring basis included the assets acquired and liabilities assumed in connection with the acquisition of 34 storage facilities (see note 4). To determine the fair value of land, the Company used prices per acre derived from observed transactions involving comparable land in similar locations, which is considered a Level 2 input. To determine the fair value of buildings, equipment and improvements, the Company used current replacement cost based on information derived from construction industry data by geographic region which is considered a Level 2 input. The replacement cost is then adjusted for the age, condition, and economic obsolescence associated with these assets, which are considered Level 3 inputs. The fair value of in-place customer leases is based on the rent lost due to the amount of time required to replace existing customers which is based on the Company’s historical experience with turnover at its facilities, which is a Level 3 input. Other assets acquired and liabilities assumed in the acquisitions consist primarily of prepaid or accrued real estate taxes and deferred revenues from advance monthly rentals paid by customers. The fair values of these assets and liabilities are based on their carrying values as they typically turn over within one year from the acquisition date and these are Level 3 inputs.

Investment in Joint Ventures

Investment in Joint Ventures	6 Months Ended
	Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Investment in Joint Ventures	9. INVESTMENT IN JOINT VENTURES The Company has a 20% ownership interest in Sovran HHF Storage Holdings LLC (“Sovran HHF”), a joint venture that was formed in May 2008 to acquire self-storage properties that are managed by the Company. The carrying value of the Company’s investment at June 30, 2016 and December 31, 2015 was $44.1 million and $44.6 million, respectively. Twenty-five properties were acquired by Sovran HHF in 2008 for approximately $171.5 million and 14 additional properties were acquired by Sovran HHF in 2014 for $187.2 million. In 2008, the Company contributed $18.6 million to the joint venture as its share of capital required to fund the acquisitions. In 2012 the Company contributed an additional $1.2 million to the joint venture. In 2013 the Company received a return of capital distribution of $3.4 million as part of the refinancing of Sovran HHF. In 2014 the Company contributed an additional $28.6 million in cash to the joint venture as its share of capital required to fund acquisitions. In 2015 the Company contributed an additional $0.4 million in cash to the joint venture as its share of capital required to fund certain capital expenditures and property taxes related to 2014 acquisitions. As of June 30, 2016, the carrying value of the Company’s investment in Sovran HHF exceeds its share of the underlying equity in net assets of Sovran HHF by approximately $1.7 million as a result of the capitalization of certain acquisition related costs in 2008. This difference is included in the carrying value of the investment, which is assessed for other-than-temporary impairment on a periodic basis. No other-than-temporary impairments have been recorded on this investment. The Company has a 15% ownership interest in Sovran HHF Storage Holdings II LLC (“Sovran HHF II”), a joint venture that was formed in 2011 to acquire self-storage properties that are managed by the Company. The carrying value of the Company’s investment at June 30, 2016 and December 31, 2015 was $13.8 million and $13.9 million, respectively. Twenty properties were acquired by Sovran HHF II during 2011 for approximately $166.1 million. During 2011, the Company contributed $12.8 million to the joint venture as its share of capital required to fund the acquisitions. Ten additional properties were acquired by Sovran HHF II during 2012 for approximately $29 million. During 2012, the Company contributed $2.4 million to the joint venture as its share of capital required to fund the acquisitions. In 2015 the Company contributed an additional $1.7 million in cash to the joint venture as its share of capital required to fund the payoff of a mortgage note. The carrying value of this investment is assessed for other-than-temporary impairment on a periodic basis and no such impairments have been recorded on this investment. As manager of Sovran HHF and Sovran HHF II, the Company earns a management and call center fee of 7% of gross revenues which totaled $1.3 million and $1.2 million for the three months ended June 30, 2016 and 2015, respectively. The management and call center fees earned by the Company for the six months ended June 30, 2016 and 2015, totaled $2.5 million and $2.4 million, respectively. The Company’s share of Sovran HHF and Sovran HHF II’s income for the three months ended June 30, 2016 and 2015 was $0.9 million and $0.8 million, respectively. The Company’s share of Sovran HHF and Sovran HHF II’s income for the six months ended June 30, 2016 and 2015 was $1.8 million and $1.4 million, respectively. The Company has a 49% ownership interest in Iskalo Office Holdings, LLC, which owns the building that houses the Company’s headquarters and other tenants. The carrying value of the Company’s investment is a liability of $0.5 million at June 30, 2016 and December 31, 2015, and is included in accounts payable and accrued liabilities in the accompanying consolidated balance sheets. For the three months ended June 30, 2016, and 2015, the Company’s share of Iskalo Office Holdings, LLC’s income was $54,000 and $46,000, respectively. For the six months ended June 30, 2016, and 2015, the Company’s share of Iskalo Office Holdings, LLC’s income was $113,000 and $104,000, respectively. The Company paid rent to Iskalo Office Holdings, LLC of $0.5 million during the six months ended June 30, 2016 and 2015. The Company holds an 85% equity interest in Urban Box Coralway Storage, LLC (Urban Box), a joint venture with an unrelated third party. Urban Box was formed in 2015 and is currently developing a self-storage property in Florida. During 2015, the Company contributed $4.0 million to Urban Box as its share of capital to develop the property, which primarily consists of the acquisition of land in 2015. Urban Box has entered into a non-recourse mortgage loan in order to finance the future development costs. The Company and the other joint venture member have participation rights which require the agreement of both members in order to implement the activities of Urban Box which are most significant to its economic performance. Accordingly, the interest is recorded using the equity method. The Company will perform property management services for Urban Box in exchange for a management fee based on 6% of property revenues. There were no management fees in 2016 or 2015. The Company holds a 5% equity interest in SNL/Orix 1200 McDonald Ave., LLC (McDonald), a joint venture with an unrelated third party. The joint venture for McDonald was executed in 2016 and is currently developing a self-storage property in New York. During 2016, the Company contributed $0.4 million of common capital and $2.3 million of preferred capital to McDonald as its share of capital to develop the property. McDonald will enter into a non-recourse mortgage loan in order to finance the future development costs. In accordance with the terms of the McDonald joint venture agreement, the Company has the ability to assert influence over certain business matters. Accordingly, the interest is recorded using the equity method. The Company will perform property management services for McDonald in exchange for a management fee based on property revenues. There were no management fees in 2016 or 2015. The Company holds a 5% equity interest in SNL Orix Merrick, LLC (Merrick), a joint venture with an unrelated third party. The joint venture for Merrick was executed in 2016 and is currently developing a self-storage property in New York. During 2016, the Company contributed $0.4 million of common capital and $2.1 million of preferred capital to Merrick as its share of capital to develop the property. Merrick will enter into a non-recourse mortgage loan in order to finance the future development costs. In accordance with the terms of the Merrick joint venture agreement, the Company has the ability to assert influence over certain business matters. Accordingly, the interest is recorded using the equity method. The Company will perform property management services for Merrick in exchange for a management fee based on property revenues. There were no management fees in 2016 or 2015. A summary of the unconsolidated joint ventures’ financial statements as of and for the six months ended June 30, 2016 is as follows: (dollars in thousands) Balance Sheet Data Investment in storage facilities, net $ 535,791 Investment in office building, net 5,054 Other assets 17,701 Total Assets $ 558,546 Due to the Company $ 1,060 Mortgages payable 222,971 Other liabilities 6,836 Total Liabilities 230,867 Unaffiliated partners’ equity 262,724 Company equity 64,955 Total Partners’ Equity 327,679 Total Liabilities and Partners’ Equity $ 558,546 Income Statement Data Total revenues $ 36,569 Property operating expenses (11,881 ) Administrative, management and call center fees (2,657 ) Depreciation and amortization of customer list (6,229 ) Amortization of financing fees (177 ) Income tax expense (116 ) Interest expense (5,154 ) Net income $ 10,355 The Company does not guarantee the debt of Sovran HHF, Sovran HHF II, Iskalo Office Holdings, LLC, Urban Box, McDonald, or Merrick. We do not expect to have material future cash outlays relating to these joint ventures outside our share of capital for future acquisitions of properties.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	10. INCOME TAXES The Company qualifies as a REIT under the Internal Revenue Code of 1986, as amended, and will generally not be subject to corporate income taxes to the extent it distributes its taxable income to its shareholders and complies with certain other requirements. The Company has elected to treat one of its subsidiaries as a taxable REIT subsidiary. In general, the Company’s taxable REIT subsidiary may perform additional services for tenants and generally may engage in certain real estate or non-real estate related business. A taxable REIT subsidiary is subject to corporate federal and state income taxes. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities. For the three months ended June 30, 2016 and 2015, the Company recorded federal and state income tax expense of $0.1 million and $0.6 million, respectively. For the six months ended June 30, 2016 and 2015, the Company recorded federal and state income tax expense of $0.6 million and $1.0 million, respectively. At June 30, 2016 and 2015, there were no material unrecognized tax benefits. Interest and penalties relating to uncertain tax positions will be recognized in income tax expense when incurred. As of June 30, 2016 and 2015, the Company had no interest or penalties related to uncertain tax positions. Net income taxes payable and the deferred tax liability of our taxable REIT subsidiary are classified within accounts payable and accrued liabilities in the consolidated balance sheets. As of June 30, 2016, the Company’s taxable REIT subsidiary has current accrued taxes of $0.6 million and a deferred tax liability of $1.2 million. The tax years 2013-2015 remain open to examination by the major taxing jurisdictions to which the Company is subject.

Earnings Per Share and Earnings

Earnings Per Share and Earnings Per Unit	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share and Earnings Per Unit	11. EARNINGS PER SHARE AND EARNINGS PER UNIT The Company reports earnings per share and earnings per unit data in accordance ASC Topic 260, “ Earnings Per Share Determining Whether Instruments Granted in Share-Based Payment Transactions Are Participating Securities” Earnings Per Share (in thousands except per share data) Three Months Three Months Six Months Six Months Numerator: Net income attributable to common shareholders $ 43,456 $ 28,532 $ 71,796 $ 50,983 Denominator: Denominator for basic earnings per share – weighted average shares 41,980 35,378 40,196 34,854 Effect of Dilutive Securities: Stock options and non-vested stock 247 225 249 225 Denominator for diluted earnings per share – adjusted weighted average shares and assumed conversion 42,227 35,603 40,445 35,079 Basic earnings per common share attributable to common shareholders $ 1.04 $ 0.81 $ 1.79 $ 1.46 Diluted earnings per common share attributable to common shareholders $ 1.03 $ 0.80 $ 1.78 $ 1.45 Earnings Per Unit The following table sets forth the computation of basic and diluted earnings per common unit utilizing the two-class method. (in thousands except per unit data) Three Months Three Months Six Months Six Months Numerator: Net income attributable to common unitholders $ 43,456 $ 28,532 $ 71,796 $ 50,983 Denominator: Denominator for basic earnings per unit – weighted average units 41,980 35,378 40,196 34,854 Effect of Dilutive Securities: Stock options and non-vested stock 247 225 249 225 Denominator for diluted earnings per unit – adjusted weighted average units and assumed conversion 42,227 35,603 40,445 35,079 Basic earnings per common unit attributable to common unitholders $ 1.04 $ 0.81 $ 1.79 $ 1.46 Diluted earnings per common unit attributable to common unitholders $ 1.03 $ 0.80 $ 1.78 $ 1.45 Not included in the effect of dilutive securities above for both earnings per share and earnings per unit are 102,173 unvested restricted shares for the three months ended June 30, 2016, and 11,000 stock options and 161,412 unvested restricted shares for the three months ended June 30, 2015, because their effect would be antidilutive. Not included in the effect of dilutive securities above are 116,373 unvested restricted shares for the six months ended June 30, 2016, and 5,500 stock options and 166,316 unvested restricted shares for the six months ended June 30, 2015, because their effect would be antidilutive.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Shareholders' Equity	12. SHAREHOLDERS’ EQUITY The following is a reconciliation of the changes in the Parent Company’s total shareholders’ equity for the period: (dollars in thousands) Six Months Beginning balance of total shareholders’ equity $ 1,202,315 Net proceeds from the issuance of common stock 942,150 Conversion of operating partnership units to common shares 4,795 Exercise of stock options — Earned portion of non-vested stock 3,757 Stock option expense 81 Deferred compensation—directors 45 Adjustment to redemption value on noncontrolling redeemable Operating Partnership units 920 Net income attributable to common shareholders 71,796 Change in fair value of derivatives (16,448 ) Dividends (68,637 ) Ending balance of total shareholders’ equity $ 2,140,774 On January 20, 2016, the Company completed the public offering of 2,645,000 shares of its common stock at $105.75 per share. Net proceeds to the Company after deducting underwriting discounts and commissions and offering expenses were approximately $269.7 million. The Company used the net proceeds from the offering to repay a portion of the indebtedness outstanding on the Company’s unsecured line of credit. On May 25, 2016, the Company completed the public offering of 6,900,000 shares of its common stock at $100.00 per share. Net proceeds to the Company after deducting underwriting discounts and commissions and offering expenses were approximately $665.4 million. The Company initially used the net proceeds from the offering to repay the indebtedness outstanding on the Company’s unsecured line of credit. The proceeds from this offering and the proceeds from the 2026 Senior Notes (see Note 5) were used, along with draws on the Company’s revolving line of credit, to fund the purchase of LifeStorage, LP on July 15, 2016 (see Note 16). On May 12, 2014, the Company entered into a continuous equity offering program (“Equity Program”) with Wells Fargo Securities, LLC (“Wells Fargo”), Jefferies LLC (“Jefferies”), SunTrust Robinson Humphrey, Inc. (“SunTrust”), Piper Jaffray & Co. (“Piper”), HSBC Securities (USA) Inc. (“HSBC”), and BB&T Capital Markets, a division of BB&T Securities, LLC (“BB&T”), pursuant to which the Company may sell from time to time up to $225 million in aggregate offering price of shares of the Company’s common stock. Actual sales under the Equity Program will depend on a variety of factors and conditions, including, but not limited to, market conditions, the trading price of the Company’s common stock, and determinations of the appropriate sources of funding for the Company. The Company expects to continue to offer, sell, and issue shares of common stock under the Equity Program from time to time based on various factors and conditions, although the Company is under no obligation to sell any shares under the Equity Program. During the six months ended June 30, 2016, the Company did not issue any shares of common stock under the Equity Program. As of June 30, 2016, the Company had $59.3 million available for issuance under the Equity Program. During the six months ended June 30, 2015, the Company issued 199,700 shares of common stock under the Equity Program at a weighted average issue price of $91.53 per share, generating net proceeds of $18.0 million after deducting $0.2 million of sales commissions paid to Jefferies. In 2013, the Company implemented a Dividend Reinvestment Plan. The Company issued 66,992 and 73,186 shares under the plan during the six months ended June 30, 2016 and June 30, 2015, respectively.

Partners' Capital

Partners' Capital	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Partners' Capital	13. PARTNERS’ CAPITAL The following is a reconciliation of the changes in total partners’ capital for the period: (dollars in thousands) Six Months Beginning balance of total controlling partners’ capital $ 1,202,315 Net proceeds from the issuance of partnership units 942,150 Conversion of operating partnership units to common shares 4,795 Exercise of stock options — Earned portion of non-vested stock 3,757 Stock option expense 81 Deferred compensation—directors 45 Adjustment to redemption value on limited partners’ redeemable capital interests 920 Net income attributable to common unitholders 71,796 Change in fair value of derivatives (16,448 ) Distributions (68,637 ) Ending balance of total controlling partners’ capital $ 2,140,774

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	14. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605),” and requires an entity to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. The Company has the option to apply the provisions of ASU 2014-09 either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying the new guidance recognized at the date of initial application. The Company has not yet completed its assessment of the impact that the adoption of ASU 2014-09 will have on its consolidated financial statements. In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” which requires a reporting entity to treat a performance target that affects vesting and that could be achieved after the requisite service period as a performance condition. ASU 2014-12 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. ASU 2014-12 may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption, and to all new or modified awards thereafter. The adoption of ASU 2014-12 by the Company did not have a material impact on its consolidated financial statements. In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis”. This ASU is effective for annual reporting periods beginning after December 15, 2015 including interim periods within that reporting period. ASU 2015-02 amends the current consolidation model specifically as it relates to variable interest entities (“VIE’s”) and provides reporting entities with a revised consolidation analysis procedure. The adoption of ASU 2015-02 by the Company did not have a material impact on its consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments”. ASU 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. ASU 2015-16 is effective for fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2015. The adoption of ASU 2015-16 by the Company did not have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”. This guidance revises existing practice related to accounting for leases under Accounting Standards Codification Topic 840 Leases In March 2016, the FASB issued ASU 2016-06, “Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments”. ASU 2016-06 simplifies the embedded derivative analysis for debt instruments containing contingent call or put options by removing the requirement to assess whether a contingent event is related to interest rates or credit risks. The new standard will be effective for us on January 1, 2017. The Company has not yet completed its assessment of the impact that the adoption of ASU 2016-06 will have on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, “Investments—Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting”. ASU 2016-07 eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an adjustment must be made to the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The new standard will be effective for us on January 1, 2017. The Company has not yet completed its assessment of the impact that the adoption of ASU 2016-07 will have on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting” as part of its simplification initiative, which involves several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The amendments in this update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has not yet completed its assessment of the impact that the adoption of ASU 2016-09 will have on its consolidated financial statements.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	15. COMMITMENT AND CONTINGENCIES At June 30, 2016, the Company was under contract to acquire 84 self-storage facilities included with the acquisition of LifeStorage, LP for approximately $1.3 billion (see Note 16). The Company was also under contract at June 30, 2016 to acquire an additional five self-storage facilities unrelated to the LifeStorage, LP acquisition for an aggregate purchase price of approximately $49 million. On July 29, 2016, we completed the acquisition of one of these five facilities for a purchase price of $8.4 million and on August 4, 2016, we completed the acquisition of another of these five facilities for a purchase price of $8.9 million. The purchase of the three remaining facilities is subject to customary conditions to closing, and there is no assurance that these four facilities will be acquired. At June 30, 2016, the Company had commitments totaling $6.3 million to third party advisors related to the LifeStorage, LP acquisition. The commitments were contingent upon the closing of the LifeStorage, LP acquisition. Payment was made to the third party advisors in July 2016 in connection with the closing of the LifeStorage, LP acquisition and the related expense was recorded as acquisition costs in the third quarter of 2016. On or about August 25, 2014, a putative class action was filed against the Company in the Superior Court of New Jersey Law Division Burlington County. The action seeks to obtain declaratory, injunctive and monetary relief for a class of consumers based upon alleged violations by the Company of the New Jersey Truth in Customer Contract, Warranty and Notice Act, the New Jersey Consumer Fraud Act and the New Jersey Insurance Producer Licensing Act. On October 17, 2014, the action was removed from the Superior Court of New Jersey Law Division Burlington County to the United States District Court for the District of New Jersey. The Company brought a motion to partially dismiss the complaint for failure to state a claim, and on July 16, 2015, the Company’s motion was granted in part and denied in part. The Company intends to vigorously defend the action, and the possibility of any adverse outcome cannot be determined at this time.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	16. SUBSEQUENT EVENTS On July 1, 2016, the Company declared a quarterly dividend of $0.95 per common share. The dividend was paid on July 26, 2016 to shareholders of record on July 15, 2016. The total dividend paid amounted to $43.9 million. On July 15, 2016, the Company acquired all of the outstanding partnership interests in LifeStorage, LP, a Delaware limited partnership (LifeStorage). Pursuant to the acquisition, the Company acquired 84 self-storage properties throughout the country, including the following markets: Chicago, Illinois; Las Vegas, Nevada; Sacramento, California; Austin, Texas; and Los Angeles, California. Pursuant to the terms of the Agreement and Plan of Merger dated as of May 18, 2016 by and among LifeStorage, the Operating Partnership, Solar Lunar Sub, LLC, a Delaware limited liability company and wholly-owned subsidiary of the Operating Partnership (“Merger Sub”), and Fortis Advisors LLC, a Delaware limited liability company, as Sellers’ Representative, the Company paid aggregate consideration of approximately $1.3 billion, of which $482 million was paid to discharge existing indebtedness of LifeStorage (including certain prepayment and defeasance costs). The merger was funded with the existing cash that was generated primarily from the proceeds from the Company’s May 2016 common stock offering and the 2026 Senior Notes offering, and draws on the Company’s line of credit totaling $482 million. Disclosures related to the preliminary allocation of purchase price for the LifeStorage acquisition are not currently available as the Company is in the process of assigning value to the major assets acquired which primarily include investment in storage facilities, the LifeStorage tradename and in-place customer leases. See Note 4 for pro forma information. On July 18, 2016, the Company announced that it will rebrand all storage facilities it presently operates as “Uncle Bobs Self Storage” to “Life Storage” beginning in August, 2016. This will require replacement of signage at all existing storage facilities which is currently included in investment in storage facilities, net on the consolidated balance sheets. The Company has reassessed the estimated useful lives of the existing signage and currently estimates an increase in depreciation expense of approximately $8 million combined in the third and fourth quarters of 2016, and approximately $1 million in 2017. On July 21, 2016, the Company entered into a $200 million term note maturing July 2028 bearing interest at a fixed rate of 3.67%. The proceeds from this term note were used to repay a portion of the outstanding balance on the Company’s line of credit. The outstanding balance on the Company’s line of credit after the LifeStorage, LP acquisition and the paydown with the proceeds from this term note was $298 million.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]
Reclassification	Reclassification:
Fair Value Measurements and Disclosures	The assets and liabilities of the other 33 storage facilities acquired in 2016, which primarily consist of tangible and intangible assets, are measured at fair value on the date of acquisition in accordance with the principles of FASB ASC Topic 820, “ Fair Value Measurements and Disclosures”
Revenue from Contracts with Customers	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605),” and requires an entity to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. The Company has the option to apply the provisions of ASU 2014-09 either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying the new guidance recognized at the date of initial application. The Company has not yet completed its assessment of the impact that the adoption of ASU 2014-09 will have on its consolidated financial statements.
Accounting for Share-Based Payments	In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” which requires a reporting entity to treat a performance target that affects vesting and that could be achieved after the requisite service period as a performance condition. ASU 2014-12 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. ASU 2014-12 may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption, and to all new or modified awards thereafter. The adoption of ASU 2014-12 by the Company did not have a material impact on its consolidated financial statements.
Consolidation Variable Interest Entity	In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis”. This ASU is effective for annual reporting periods beginning after December 15, 2015 including interim periods within that reporting period. ASU 2015-02 amends the current consolidation model specifically as it relates to variable interest entities (“VIE’s”) and provides reporting entities with a revised consolidation analysis procedure. The adoption of ASU 2015-02 by the Company did not have a material impact on its consolidated financial statements.
Business Combinations	In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments”. ASU 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. ASU 2015-16 is effective for fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2015. The adoption of ASU 2015-16 by the Company did not have a material impact on its consolidated financial statements.
Leases	In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”. This guidance revises existing practice related to accounting for leases under Accounting Standards Codification Topic 840 Leases

Organization (Tables)

Organization (Tables)	6 Months Ended
	Jun. 30, 2016
Summary of Reconciliation of Noncontrolling Interests	The following is a reconciliation of the Parent Company’s noncontrolling interests for the period: (dollars in thousands) Six Months Beginning balance noncontrolling redeemable Operating Partnership Units $ 18,171 Issuance of Operating Partnership Units 7,767 Redemption of Operating Partnership Units (4,795 ) Net income attributable to noncontrolling interest in the Operating Partnership 338 Distributions (370 ) Adjustment to redemption value (920 ) Ending balance noncontrolling redeemable Operating Partnership Units $ 20,191
Sovran Acquisition Limited Partnership [Member]
Summary of Reconciliation of Noncontrolling Interests	The following is a reconciliation of the Operating Partnership’s noncontrolling interests for the period: (dollars in thousands) Six Months Beginning balance Limited Partners’ Redeemable Capital Interest $ 18,171 Issuance of Limited Partners’ Redeemable Capital Interest Units 7,767 Redemption of Limited Partners’ Redeemable Capital Interest Units (4,795 ) Net income attributable to Limited Partners’ Redeemable Capital Interest 338 Distributions (370 ) Adjustment to redemption value (920 ) Ending balance Limited Partners’ Redeemable Capital Interest $ 20,191

Investment in Storage Facilit25

Investment in Storage Facilities (Tables)	6 Months Ended
	Jun. 30, 2016
Real Estate [Abstract]
Summary of Activity in Storage Facilities	The following summarizes our activity in storage facilities during the six months ended June 30, 2016. (dollars in thousands) Cost: Beginning balance $ 2,491,702 Acquisition of storage facilities 431,460 Improvements and equipment additions 13,624 Additions to consolidated subsidiary 2,117 Net increase in construction in progress 12,724 Dispositions (29,333 ) Ending balance $ 2,922,294 Accumulated Depreciation: Beginning balance $ 465,195 Additions during the period 31,674 Dispositions (10,348 ) Ending balance $ 486,521
Schedule of Acquired Facilities and Purchase Price of Facilities	The purchase price of the 34 facilities acquired in 2016 has been preliminarily assigned as follows: (dollars in thousands) Consideration paid Acquisition Date Fair Value State Number Date of Purchase Cash Value of Mortgage Net Other Land Building, In-Place Closing Florida 4 1/6/2016 $ 20,350 $ 20,246 $ — $ — $ 104 $ 6,646 $ 13,339 $ 365 $ 372 California 4 1/21/2016 78,750 78,562 — — 188 27,876 49,860 1,014 332 New Hampshire 5 1/21/2016 54,225 53,941 — — 284 12,902 40,428 895 576 Massachusetts 1 1/21/2016 11,375 11,350 — — 25 4,874 6,335 166 65 Texas 3 1/21/2016 42,050 41,894 — — 156 23,487 18,000 563 251 Arizona 1 2/1/2016 9,275 9,261 — — 14 988 8,224 63 120 Florida 1 2/12/2016 11,274 11,270 — — 4 2,294 8,980 — — Pennsylvania 1 2/17/2016 5,750 5,732 — — 18 1,768 3,879 103 148 Colorado 1 2/29/2016 12,600 12,549 — — 51 4,528 7,915 157 172 California 3 3/16/2016 68,832 63,965 4,472 — 395 22,647 45,371 814 265 California 1 3/17/2016 17,320 17,278 — — 42 6,728 10,339 253 116 California 1 4/11/2016 36,750 33,346 3,295 — 109 17,445 18,840 465 125 Connecticut 2 4/14/2016 17,313 17,152 — — 161 6,142 10,904 267 172 New York 2 4/26/2016 24,312 20,143 — 4,249 (80 ) 5,710 18,201 401 340 Florida 1 5/2/2016 8,100 4,006 — 4,036 58 3,018 4,922 160 144 Texas 1 5/5/2016 10,800 10,708 — — 92 2,333 8,302 165 117 New York 2 5/19/2016 8,400 8,366 — — 34 714 7,521 165 180 Total acquired 34 $ 437,476 $ 419,769 $ 7,767 $ 8,285 $ 1,655 $ 150,100 $ 281,360 $ 6,016 $ 3,495
Schedule of Fair Value of In-Place Customer Lease Intangible Assets	The Company measures the fair value of in-place customer lease intangible assets based on the Company’s experience with customer turnover. The Company amortizes in-place customer leases on a straight-line basis over 12 months (the estimated future benefit period). In-place customer leases are included in other assets on the Company’s consolidated balance sheets as follows: (Dollars in thousands) Jun. 30, Dec. 31, In-place customer leases $ 28,237 $ 22,320 Accumulated amortization (23,912 ) (21,017 ) Net carrying value at the end of period $ 4,325 $ 1,303
Pro Forma Information Based on Combined Historical Financial Statements on Properties Acquired	The following pro forma information is based on the combined historical financial statements of the Company, the 34 properties acquired during the six months ended June 30, 2016, and LifeStorage, LP as if the acquisitions had all occurred as of January 1, 2015. (Dollars in thousands, except per share data) Three Three Six Six Total revenues $ 128,494 $ 113,999 $ 251,813 $ 221,356 Net income attributable to common shareholders $ 53,890 $ 12,771 $ 84,239 $ 18,490 Earnings per common share Basic $ 1.17 $ 0.28 $ 1.83 $ 0.40 Diluted $ 1.16 $ 0.28 $ 1.82 $ 0.40
Summary of Revenues and Earnings Related to Properties Included in Company's Consolidated Statements of Operations	The following table summarizes the revenues and earnings since the acquisition dates that are included in the Company’s consolidated statements of operations for the six months ended June 30, 2016 related to the 34 properties acquired during the three and six months ended June 30, 2016. (Dollars in thousands) Three Months Six Months Total revenues $ 7,967 $ 11,720 Net loss attributable to common shareholders $ (376 ) $ (2,275 )
Summary of Revenues and Expenses Related to Sale of Properties Included in Company's Consolidated Statements of Operations	The following table summarizes the revenues and expenses up to the dates of sale of the 11 properties sold in 2016 and 2015 that are included in the Company’s consolidated statements of operations for 2016 and 2015. (Dollars in thousands) Three Months Three Months Six Months Six Months Total operating revenues $ 1,171 $ 1,140 $ 2,324 $ 2,258 Property operations and maintenance expense (299 ) (321 ) (614 ) (644 ) Real estate tax expense (25 ) (69 ) (98 ) (138 ) Depreciation and amortization expense (179 ) (174 ) (359 ) (350 ) Gain (loss) on sale of storage facilities 15,270 — 15,270 (7 ) $ 15,938 $ 576 $ 16,523 $ 1,119

Unsecured Line of Credit and 26

Unsecured Line of Credit and Term Notes (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Borrowings Outstanding on Unsecured Line of Credit and Term Notes	Borrowings outstanding on our unsecured line of credit and term notes are as follows: (Dollars in thousands) Jun. 30, Dec. 31, Revolving line of credit borrowings $ — $ 79,000 Term note due April 26, 2016 — 150,000 Term note due June 4, 2020 325,000 325,000 Term note due August 5, 2021 100,000 100,000 Term note due April 8, 2024 175,000 175,000 Senior term note due July 1, 2026 600,000 — Total principal balance outstanding 1,200,000 750,000 Less: unamortized debt issuance costs (8,912 ) (3,350 ) Less: unamortized senior term note discount (3,318 ) — Term notes payable $ 1,187,770 $ 746,650

Mortgages Payable and Debt Ma27

Mortgages Payable and Debt Maturities (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Summary of Mortgage Payable	Mortgages payable at June 30, 2016 and December 31, 2015 consist of the following: (dollars in thousands) June 30, December 31, 4.065% mortgage note due April 1, 2023, secured by one self-storage facility with an aggregate net book value of $7.6 million, principal and interest paid monthly (effective interest rate 4.29%) 4,249 — 5.26% mortgage note due November 1, 2023, secured by one self-storage facility with an aggregate net book value of $8.2 million, principal and interest paid monthly (effective interest rate 5.58%) 4,033 — 5.99% mortgage note due May 1, 2026, secured by one self-storage facility with an aggregate net book value of $4.3 million, principal and interest paid monthly (effective interest rate 6.24%) 1,923 1,993 Total mortgages payable $ 10,205 $ 1,993
Summary of Debt Obligation and Interest Rate Derivatives	Accordingly, the estimates presented below are not necessarily indicative of the amounts the Company would realize in a current market exchange. Expected Maturity Date Including Discount (dollars in thousands) 2016 2017 2018 2019 2020 Thereafter Total Fair Line of credit - variable rate LIBOR + 1.10% — — — — — — — — Notes Payable: Term note - variable rate LIBOR+1.15% — — — — $ 325,000 — $ 325,000 $ 325,000 Term note - fixed rate 5.54% — — — — — $ 100,000 $ 100,000 $ 114,096 Term note - fixed rate 4.533% — — — — — $ 175,000 $ 175,000 $ 190,191 Term note - fixed rate 3.50% — — — — — $ 600,000 $ 600,000 $ 606,553 Mortgage note - fixed rate 4.065% $ 42 $ 88 $ 92 $ 96 $ 99 $ 3,832 $ 4,249 $ 4,255 Mortgage note - fixed rate 5.26% $ 30 $ 63 $ 67 $ 71 $ 74 $ 3,728 $ 4,033 $ 4,332 Mortgage note - fixed rate 5.99% $ 71 $ 151 $ 160 $ 170 $ 181 $ 1,190 $ 1,923 $ 2,083 Interest rate derivatives – liability — — — — — — — $ 22,010

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swap Agreements	The Company has interest rate swap agreements in effect at June 30, 2016 as detailed below to effectively convert a total of $325 million of variable-rate debt to fixed-rate debt. Notional Amount Effective Date Expiration Date Fixed Floating Rate $125 Million 9/1/2011 8/1/18 2.3700 % 1 month LIBOR $100 Million 12/30/11 12/29/17 1.6125 % 1 month LIBOR $100 Million 9/4/13 9/4/18 1.3710 % 1 month LIBOR $100 Million 12/29/17 11/29/19 3.9680 % 1 month LIBOR $125 Million 8/1/18 6/1/20 4.1930 % 1 month LIBOR
Summary of Changes in AOCL	The changes in AOCL for the three and six months ended June 30, 2016 and June 30, 2015 are summarized as follows: (dollars in thousands) Apr. 1, 2016 Apr. 1, 2015 Jan. 1, 2016 Jan. 1, 2015 Accumulated other comprehensive loss beginning of period $ (26,511 ) $ (16,992 ) $ (14,415 ) $ (13,005 ) Realized loss reclassified from accumulated other comprehensive loss to interest expense 1,160 1,359 2,357 2,718 Unrealized loss from changes in the fair value of the effective portion of the interest rate swaps (5,512 ) 1,062 (18,805 ) (4,284 ) Loss included in other comprehensive loss (4,352 ) 2,421 (16,448 ) (1,566 ) Accumulated other comprehensive loss end of period $ (30,863 ) $ (14,571 ) $ (30,863 ) $ (14,571 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Assets and Liabilities Carried at Fair Value Measured on Recurring Basis	The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2016 and December 31, 2015 (in thousands): Asset Level 1 Level 2 Level 3 June 30, 2016 Interest rate swaps $ (22,010 ) — $ (22,010 ) — December 31, 2015 Interest rate swaps $ 550 — $ 550 — Interest rate swaps $ (15,343 ) — $ (15,343 ) —

Investment in Joint Ventures (T

Investment in Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Summary of Unconsolidated Joint Ventures' Financial Statements	A summary of the unconsolidated joint ventures’ financial statements as of and for the six months ended June 30, 2016 is as follows: (dollars in thousands) Balance Sheet Data Investment in storage facilities, net $ 535,791 Investment in office building, net 5,054 Other assets 17,701 Total Assets $ 558,546 Due to the Company $ 1,060 Mortgages payable 222,971 Other liabilities 6,836 Total Liabilities 230,867 Unaffiliated partners’ equity 262,724 Company equity 64,955 Total Partners’ Equity 327,679 Total Liabilities and Partners’ Equity $ 558,546 Income Statement Data Total revenues $ 36,569 Property operating expenses (11,881 ) Administrative, management and call center fees (2,657 ) Depreciation and amortization of customer list (6,229 ) Amortization of financing fees (177 ) Income tax expense (116 ) Interest expense (5,154 ) Net income $ 10,355

Earnings Per Share and Earnin31

Earnings Per Share and Earnings Per Unit (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Common Share/Unit	The following table sets forth the computation of basic and diluted earnings per common share utilizing the two-class method. Earnings Per Share (in thousands except per share data) Three Months Three Months Six Months Six Months Numerator: Net income attributable to common shareholders $ 43,456 $ 28,532 $ 71,796 $ 50,983 Denominator: Denominator for basic earnings per share – weighted average shares 41,980 35,378 40,196 34,854 Effect of Dilutive Securities: Stock options and non-vested stock 247 225 249 225 Denominator for diluted earnings per share – adjusted weighted average shares and assumed conversion 42,227 35,603 40,445 35,079 Basic earnings per common share attributable to common shareholders $ 1.04 $ 0.81 $ 1.79 $ 1.46 Diluted earnings per common share attributable to common shareholders $ 1.03 $ 0.80 $ 1.78 $ 1.45 Earnings Per Unit The following table sets forth the computation of basic and diluted earnings per common unit utilizing the two-class method. (in thousands except per unit data) Three Months Three Months Six Months Six Months Numerator: Net income attributable to common unitholders $ 43,456 $ 28,532 $ 71,796 $ 50,983 Denominator: Denominator for basic earnings per unit – weighted average units 41,980 35,378 40,196 34,854 Effect of Dilutive Securities: Stock options and non-vested stock 247 225 249 225 Denominator for diluted earnings per unit – adjusted weighted average units and assumed conversion 42,227 35,603 40,445 35,079 Basic earnings per common unit attributable to common unitholders $ 1.04 $ 0.81 $ 1.79 $ 1.46 Diluted earnings per common unit attributable to common unitholders $ 1.03 $ 0.80 $ 1.78 $ 1.45

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Reconciliation of Changes in Parent Company's Total Shareholders' Equity	The following is a reconciliation of the changes in the Parent Company’s total shareholders’ equity for the period: (dollars in thousands) Six Months Beginning balance of total shareholders’ equity $ 1,202,315 Net proceeds from the issuance of common stock 942,150 Conversion of operating partnership units to common shares 4,795 Exercise of stock options — Earned portion of non-vested stock 3,757 Stock option expense 81 Deferred compensation—directors 45 Adjustment to redemption value on noncontrolling redeemable Operating Partnership units 920 Net income attributable to common shareholders 71,796 Change in fair value of derivatives (16,448 ) Dividends (68,637 ) Ending balance of total shareholders’ equity $ 2,140,774

Partners' Capital (Tables)

Partners' Capital (Tables)	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Reconciliation of Changes in Total Partners' Capital	The following is a reconciliation of the changes in total partners’ capital for the period: (dollars in thousands) Six Months Beginning balance of total controlling partners’ capital $ 1,202,315 Net proceeds from the issuance of partnership units 942,150 Conversion of operating partnership units to common shares 4,795 Exercise of stock options — Earned portion of non-vested stock 3,757 Stock option expense 81 Deferred compensation—directors 45 Adjustment to redemption value on limited partners’ redeemable capital interests 920 Net income attributable to common unitholders 71,796 Change in fair value of derivatives (16,448 ) Distributions (68,637 ) Ending balance of total controlling partners’ capital $ 2,140,774

Organization - Additional Infor

Organization - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)StatesPropertyshares	Dec. 31, 2015shares	Dec. 31, 2012Property	Dec. 31, 2011Property	Dec. 31, 2008Property
Organization [Line Items]
Percentage of ownership interest of the subsidiary and its limited partnership which controls the operations of the Operating Partnership	99.60%
Number of self-storage properties owned and managed	563
Number of states in which self-storage properties owned and managed | States	26
Number of properties managed with no ownership	16
Units of redeemable noncontrolling interest in operating partnership | shares	196,008	168,866
Noncontrolling limited partnership unit redemption value	One common share or cash
Number of units issued for acquisition | shares	69,005
Fair value of units, issued for acquisition | $	$ 7,767
Sovran HHF Storage Holdings LLC [Member]
Organization [Line Items]
Number of properties owned and managed under twenty-percent stake joint venture	39				25
Percentage ownership in unconsolidated joint venture	20.00%
Sovran HHF Storage Holdings II LLC [Member]
Organization [Line Items]
Percentage of variable interest ownership in unconsolidated joint venture	15.00%
Number of properties owned and managed under fifteen-percent stake joint venture	30		10	20
Uncle Bob's Management, LLC [Member]
Organization [Line Items]
Percentage of ownership by subsidiary	60.00%
Geographic Concentration Risk [Member] | Texas and Florida [Member] | Revenue [Member]
Organization [Line Items]
Concentration risk, percentage	40.50%
Geographic Concentration Risk [Member] | Houston Texas [Member] | Revenue [Member]
Organization [Line Items]
Concentration risk, percentage	9.60%

Organization - Summary of Recon

Organization - Summary of Reconciliation of Noncontrolling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Noncontrolling interest, beginning balance			$ 18,171
Issuance of Operating Partnership Units/Limited Partners' Redeemable Capital Interest Units			7,767
Redemption of Operating Partnership Units/Limited Partners' Redeemable Capital Interest Units			(4,795)
Net income attributable to noncontrolling interest in the Operating Partnership/Limited Partners' Redeemable Capital Interest	$ 208	$ 144	338	$ 250
Distributions			(370)
Adjustment to redemption value			(920)
Noncontrolling interest, ending balance	20,191		20,191
Sovran Acquisition Limited Partnership [Member]
Class of Stock [Line Items]
Noncontrolling interest, beginning balance			18,171
Issuance of Operating Partnership Units/Limited Partners' Redeemable Capital Interest Units			7,767
Redemption of Operating Partnership Units/Limited Partners' Redeemable Capital Interest Units			(4,795)
Net income attributable to noncontrolling interest in the Operating Partnership/Limited Partners' Redeemable Capital Interest	208	$ 144	338	$ 250
Distributions			(370)
Adjustment to redemption value			(920)
Noncontrolling interest, ending balance	$ 20,191		$ 20,191

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock option expense	$ 35,000	$ 81,000	$ 81,000	$ 117,000
Amortization of non-vested stock grants and performance-based awards	$ 1,891,000	$ 1,579,000	$ 3,757,000	$ 3,191,000
Stock options exercised by employees and directors	0	5,500	0	15,000
Number of shares of non-vested stock that vested	3,696	5,995	10,881	11,229

Investment in Storage Facilit37

Investment in Storage Facilities - Summary of Activity in Storage Facilities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)
Cost:
Beginning balance	$ 2,491,702
Acquisition of storage facilities	431,460
Improvements and equipment additions	13,624
Additions to consolidated subsidiary	2,117
Net increase in construction in progress	12,724
Dispositions	(29,333)
Ending balance	2,922,294
Accumulated Depreciation:
Beginning balance	465,195
Additions during the period	31,674
Dispositions	(10,348)
Ending balance	$ 486,521

Investment in Storage Facilit38

Investment in Storage Facilities - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016USD ($)Facility	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)FacilityPropertyStore	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)PropertyStore
Investment Holdings [Line Items]
Number of storage facilities acquired | Facility	34		34
Stores acquired at certificate of occupancy | Store			1
Cash paid for properties acquired			$ 419,800
Deposits paid at the time of contract					$ 4,000
Acquisition costs	$ 1,694	$ 788	4,078	$ 1,369
Issuance of Operating Partnership Units			7,800
Outstanding balances of two mortgages	8,300		8,300
Net other liabilities	1,700		$ 1,700
Amortization period for in-place customer leases on a straight-line basis			12 months
Amortization expense related to in-place customer leases	1,800	1,000	$ 3,000	2,000
Amortization expense expected for 2016	6,300		6,300
Amortization expense expected for 2017	1,000		1,000
Reductions to acquisition costs	1,700		4,100
Net proceeds from the sale of storage facilities			34,074	711
(Loss) gain on sale of storage facilities	15,270		15,270	(7)
Bridge Financing [Member]
Investment Holdings [Line Items]
Reductions to interest expense	7,300		7,300
July 2016 Acquisitions [Member]
Investment Holdings [Line Items]
Acquisition costs			$ 600
LifeStorage, LP [Member]
Investment Holdings [Line Items]
Number of storage facilities acquired | Store			8		17
Acquisition costs			$ 6,300
Amortization expense related to in-place customer leases		$ 13,200		$ 26,500
Property Dispositions [Member]
Investment Holdings [Line Items]
Number of properties sold | Property			8		3
Carrying value of properties sold	$ 18,800		$ 18,800		$ 5,100
Net proceeds from the sale of storage facilities			34,100		4,600
(Loss) gain on sale of storage facilities			$ 15,300		$ (500)

Investment in Storage Facilit39

Investment in Storage Facilities - Schedule of Acquired Facilities and Purchase Price of Facilities (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)Facility	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)FacilityProperty	Jun. 30, 2015USD ($)
Investment Holdings [Line Items]
Number of Properties | Facility	34		34
Cash Paid			$ 419,800
Closing Costs Expensed	$ 1,694	$ 788	$ 4,078	$ 1,369
Acquisitions 2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			34
Purchase Price	437,476		$ 437,476
Cash Paid			419,769
Consideration paid Value of Operating Partnership Units Issued			7,767
Mortgage Assumed	8,285		8,285
Net Other Liabilities (Assets) Assumed	1,655		1,655
Land	150,100		150,100
Acquisition Date Building, Equipment, and Improvements	281,360		281,360
Fair Value In-Place Customers Leases	6,016		6,016
Closing Costs Expensed			$ 3,495
Florida [Member] | Date Of Acquisition, 1/6/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			4
Date of Acquisition			Jan. 6, 2016
Purchase Price	20,350		$ 20,350
Cash Paid			20,246
Net Other Liabilities (Assets) Assumed	104		104
Land	6,646		6,646
Acquisition Date Building, Equipment, and Improvements	13,339		13,339
Fair Value In-Place Customers Leases	365		365
Closing Costs Expensed			$ 372
Florida [Member] | Date Of Acquisition, 2/12/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Feb. 12, 2016
Purchase Price	11,274		$ 11,274
Cash Paid			11,270
Net Other Liabilities (Assets) Assumed	4		4
Land	2,294		2,294
Acquisition Date Building, Equipment, and Improvements	8,980		$ 8,980
Florida [Member] | Date Of Acquisition, 5/2/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			May 2, 2016
Purchase Price	8,100		$ 8,100
Cash Paid			4,006
Mortgage Assumed	4,036		4,036
Net Other Liabilities (Assets) Assumed	58		58
Land	3,018		3,018
Acquisition Date Building, Equipment, and Improvements	4,922		4,922
Fair Value In-Place Customers Leases	160		160
Closing Costs Expensed			$ 144
California [Member] | Date Of Acquisition, 1/21/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			4
Date of Acquisition			Jan. 21, 2016
Purchase Price	78,750		$ 78,750
Cash Paid			78,562
Net Other Liabilities (Assets) Assumed	188		188
Land	27,876		27,876
Acquisition Date Building, Equipment, and Improvements	49,860		49,860
Fair Value In-Place Customers Leases	1,014		1,014
Closing Costs Expensed			$ 332
California [Member] | Date Of Acquisition, 3/16/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			3
Date of Acquisition			Mar. 16, 2016
Purchase Price	68,832		$ 68,832
Cash Paid			63,965
Consideration paid Value of Operating Partnership Units Issued			4,472
Net Other Liabilities (Assets) Assumed	395		395
Land	22,647		22,647
Acquisition Date Building, Equipment, and Improvements	45,371		45,371
Fair Value In-Place Customers Leases	814		814
Closing Costs Expensed			$ 265
California [Member] | Date Of Acquisition, 3/17/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Mar. 17, 2016
Purchase Price	17,320		$ 17,320
Cash Paid			17,278
Net Other Liabilities (Assets) Assumed	42		42
Land	6,728		6,728
Acquisition Date Building, Equipment, and Improvements	10,339		10,339
Fair Value In-Place Customers Leases	253		253
Closing Costs Expensed			$ 116
California [Member] | Date Of Acquisition, 4/11/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Apr. 11, 2016
Purchase Price	36,750		$ 36,750
Cash Paid			33,346
Consideration paid Value of Operating Partnership Units Issued			3,295
Net Other Liabilities (Assets) Assumed	109		109
Land	17,445		17,445
Acquisition Date Building, Equipment, and Improvements	18,840		18,840
Fair Value In-Place Customers Leases	465		465
Closing Costs Expensed			$ 125
New Hampshire [Member] | Date Of Acquisition, 1/21/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			5
Date of Acquisition			Jan. 21, 2016
Purchase Price	54,225		$ 54,225
Cash Paid			53,941
Net Other Liabilities (Assets) Assumed	284		284
Land	12,902		12,902
Acquisition Date Building, Equipment, and Improvements	40,428		40,428
Fair Value In-Place Customers Leases	895		895
Closing Costs Expensed			$ 576
Massachusetts [Member] | Date Of Acquisition, 1/21/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Jan. 21, 2016
Purchase Price	11,375		$ 11,375
Cash Paid			11,350
Net Other Liabilities (Assets) Assumed	25		25
Land	4,874		4,874
Acquisition Date Building, Equipment, and Improvements	6,335		6,335
Fair Value In-Place Customers Leases	166		166
Closing Costs Expensed			$ 65
Texas [Member] | Date Of Acquisition, 1/21/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			3
Date of Acquisition			Jan. 21, 2016
Purchase Price	42,050		$ 42,050
Cash Paid			41,894
Net Other Liabilities (Assets) Assumed	156		156
Land	23,487		23,487
Acquisition Date Building, Equipment, and Improvements	18,000		18,000
Fair Value In-Place Customers Leases	563		563
Closing Costs Expensed			$ 251
Texas [Member] | Date Of Acquisition, 5/5/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			May 5, 2016
Purchase Price	10,800		$ 10,800
Cash Paid			10,708
Net Other Liabilities (Assets) Assumed	92		92
Land	2,333		2,333
Acquisition Date Building, Equipment, and Improvements	8,302		8,302
Fair Value In-Place Customers Leases	165		165
Closing Costs Expensed			$ 117
Arizona [Member] | Date Of Acquisition, 2/1/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Feb. 1, 2016
Purchase Price	9,275		$ 9,275
Cash Paid			9,261
Net Other Liabilities (Assets) Assumed	14		14
Land	988		988
Acquisition Date Building, Equipment, and Improvements	8,224		8,224
Fair Value In-Place Customers Leases	63		63
Closing Costs Expensed			$ 120
Pennsylvania [Member] | Date Of Acquisition, 2/17/2016[Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Feb. 17, 2016
Purchase Price	5,750		$ 5,750
Cash Paid			5,732
Net Other Liabilities (Assets) Assumed	18		18
Land	1,768		1,768
Acquisition Date Building, Equipment, and Improvements	3,879		3,879
Fair Value In-Place Customers Leases	103		103
Closing Costs Expensed			$ 148
Colorado [Member] | Date Of Acquisition, 2/29/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			1
Date of Acquisition			Feb. 29, 2016
Purchase Price	12,600		$ 12,600
Cash Paid			12,549
Net Other Liabilities (Assets) Assumed	51		51
Land	4,528		4,528
Acquisition Date Building, Equipment, and Improvements	7,915		7,915
Fair Value In-Place Customers Leases	157		157
Closing Costs Expensed			$ 172
Connecticut [Member] | Date Of Acquisition, 4/14/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			2
Date of Acquisition			Apr. 14, 2016
Purchase Price	17,313		$ 17,313
Cash Paid			17,152
Net Other Liabilities (Assets) Assumed	161		161
Land	6,142		6,142
Acquisition Date Building, Equipment, and Improvements	10,904		10,904
Fair Value In-Place Customers Leases	267		267
Closing Costs Expensed			$ 172
New York [Member] | Date Of Acquisition, 4/26/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			2
Date of Acquisition			Apr. 26, 2016
Purchase Price	24,312		$ 24,312
Cash Paid			20,143
Mortgage Assumed	4,249		4,249
Net Other Liabilities (Assets) Assumed	(80)		(80)
Land	5,710		5,710
Acquisition Date Building, Equipment, and Improvements	18,201		18,201
Fair Value In-Place Customers Leases	401		401
Closing Costs Expensed			$ 340
New York [Member] | Date Of Acquisition, 5/19/2016 [Member]
Investment Holdings [Line Items]
Number of Properties | Property			2
Date of Acquisition			May 19, 2016
Purchase Price	8,400		$ 8,400
Cash Paid			8,366
Net Other Liabilities (Assets) Assumed	34		34
Land	714		714
Acquisition Date Building, Equipment, and Improvements	7,521		7,521
Fair Value In-Place Customers Leases	$ 165		165
Closing Costs Expensed			$ 180

Investment in Storage Facilit40

Investment in Storage Facilities - Schedule of Fair Value of In-Place Customer Lease Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Real Estate [Abstract]
In-place customer leases	$ 28,237	$ 22,320
Accumulated amortization	(23,912)	(21,017)
Net carrying value at the end of period	$ 4,325	$ 1,303

Investment in Storage Facilit41

Investment in Storage Facilities - Pro Forma Information Based on Combined Historical Financial Statements on Properties Acquired (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments Schedule [Abstract]
Total revenues	$ 128,494	$ 113,999	$ 251,813	$ 221,356
Net income attributable to common shareholders	$ 53,890	$ 12,771	$ 84,239	$ 18,490
Basic	$ 1.17	$ 0.28	$ 1.83	$ 0.40
Diluted	$ 1.16	$ 0.28	$ 1.82	$ 0.40

Investment in Storage Facilit42

Investment in Storage Facilities - Summary of Revenues and Earnings Related to Properties Included in Company's Consolidated Statements of Operations (Detail) - Acquisitions 2016 [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Total revenues	$ 7,967	$ 11,720
Net loss attributable to common shareholders	$ (376)	$ (2,275)

Investment in Storage Facilit43

Investment in Storage Facilities - Summary of Revenues and Expenses Related to Sale of Properties Included in Company's Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total operating revenues	$ 107,005	$ 90,726	$ 206,129	$ 176,134
Property operations and maintenance expense	(23,153)	(19,486)	(46,014)	(40,046)
Real estate tax expense	(11,021)	(9,145)	(21,568)	(18,064)
Depreciation and amortization expense	(18,251)	(14,584)	(34,676)	(28,766)
Gain (loss) on sale of storage facilities	15,270		15,270	(7)
Properties Sold In Two Thousand And Fifteen Member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total operating revenues	1,171	1,140	2,324	2,258
Property operations and maintenance expense	(299)	(321)	(614)	(644)
Real estate tax expense	(25)	(69)	(98)	(138)
Depreciation and amortization expense	(179)	(174)	(359)	(350)
Gain (loss) on sale of storage facilities	15,270		15,270	(7)
Total income from discontinued operations	$ 15,938	$ 576	$ 16,523	$ 1,119

Unsecured Line of Credit and 44

Unsecured Line of Credit and Term Notes - Borrowings Outstanding on Unsecured Line of Credit and Term Notes (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Unsecured Line Of Credit And Term Notes [Line Items]
Revolving line of credit borrowings		$ 79,000
Total term notes payable - gross	$ 1,200,000	750,000
Less: unamortized debt issuance costs	(8,912)	(3,350)
Less: unamortized senior term note discount	(3,318)
Term notes, net of debt issuance costs	1,187,770	746,650
Term Note Due April 26, 2016 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Total term notes payable - gross		150,000
Term Note Due June 4, 2020 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Total term notes payable - gross	325,000	325,000
Term Note Due August 5, 2021 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Total term notes payable - gross	100,000	100,000
Term Note Due April 8, 2024 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Total term notes payable - gross	175,000	$ 175,000
Senior Term Note Due July 1, 2026 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Total term notes payable - gross	$ 600,000

Unsecured Line of Credit and 45

Unsecured Line of Credit and Term Notes - Additional Information (Detail)	Jun. 20, 2016USD ($)	May 17, 2016USD ($)Bridge_Loan	Apr. 08, 2014USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2011USD ($)	Jan. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Unsecured Line Of Credit And Term Notes [Line Items]
Unsecured term note				$ 1,187,770,000	$ 1,187,770,000			$ 746,650,000
Interest expense - bridge financing commitment fee				7,329,000	7,329,000
Interest coverage ratio on debt	150.00%
Unamortized senior term note discount				3,318,000	3,318,000
Underwriting discount and other offering expenses					14,183,000
Bridge Facilities [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Number of bridge facilities | Bridge_Loan		2
Senior unsecured acquisition bridge facilities, amount		$ 1,675,000,000
Interest expense - bridge financing commitment fee				7,300,000	7,300,000
Bridge loan, termination date		Jun. 29, 2016
Maximum [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Leverage ratio percentage	60.00%
Indenture covenant percentage on unencumbered assets	150.00%
Secured Debt [Member] | Maximum [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Leverage ratio percentage	40.00%
Revolving Credit Facility [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Revolving credit limit				$ 500,000,000	$ 500,000,000		$ 300,000,000
Accounting Standards Update 2015-03 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Debt issuance costs								$ 3,400,000
Maturity on December 10, 2019 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Basis spread over LIBOR					1.10%
Facility fee					0.15%
Interest rate, line of credit facility				1.54%	1.54%			1.72%
Amount available on unsecured line of credit				$ 500,000,000	$ 500,000,000
Line of credit facility, expiration date					Dec. 10, 2019
Maturity on June 4, 2020 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Basis spread over LIBOR					1.15%
Unsecured term note				$ 325,000,000	$ 325,000,000
Maturity in April, 2024 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Line of credit facility, expiration date					Apr. 8, 2024
Additional secured term note			$ 175,000,000
Term note stated interest rate				4.533%	4.533%
Repayment of Lines of Credit			$ 115,000,000
Maturity in April, 2024 [Member] | Maximum [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Term note stated interest rate				6.283%	6.283%
Maturity in August 2021 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Line of credit facility, expiration date					Aug. 5, 2021
Additional secured term note						$ 100,000,000
Term note stated interest rate						5.54%
Maturity in August 2021 [Member] | Maximum [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Term note stated interest rate						7.29%
Maturity in April 2016 [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Unsecured term note				$ 150,000,000	$ 150,000,000
Line of credit facility, expiration date					Apr. 26, 2016
Term note stated interest rate				6.38%	6.38%
Senior Term Note Due July 1, 2026 [Member] | Unsecured Senior Notes [Member]
Unsecured Line Of Credit And Term Notes [Line Items]
Debt instrument principal amount	$ 600,000,000
Debt instrument percentage	3.50%
Debt instrument percentage	0.553%
Unamortized senior term note discount	$ 3,300,000
Underwriting discount and other offering expenses	5,500,000
Proceeds from senior notes, net	$ 591,200,000

Mortgages Payable and Debt Ma46

Mortgages Payable and Debt Maturities - Summary of Mortgage Payable (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Mortgages payable	$ 10,205	$ 1,993
4.065% Mortgage Note Due April 1, 2023 [Member]
Debt Instrument [Line Items]
Mortgages payable	4,249
5.26% Mortgage Note Due November 1, 2023 [Member]
Debt Instrument [Line Items]
Mortgages payable	4,033
5.99% Mortgage Notes Due May 1, 2026 [Member]
Debt Instrument [Line Items]
Mortgages payable	$ 1,923	$ 1,993

Mortgages Payable and Debt Ma47

Mortgages Payable and Debt Maturities - Summary of Mortgage Payable (Parenthetical) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)Facility
4.065% Mortgage Note Due April 1, 2023 [Member]
Debt Instrument [Line Items]
Interest rate	4.065%
Mortgage note due date	Apr. 1, 2023
Self-storage facilities | Facility	1
Aggregate net book value of property pledged for mortgage note | $	$ 7.6
Effective interest rate	4.29%
5.26% Mortgage Note Due November 1, 2023 [Member]
Debt Instrument [Line Items]
Interest rate	5.26%
Mortgage note due date	Nov. 1, 2023
Self-storage facilities | Facility	1
Aggregate net book value of property pledged for mortgage note | $	$ 8.2
Effective interest rate	5.58%
5.99% Mortgage Notes Due May 1, 2026 [Member]
Debt Instrument [Line Items]
Interest rate	5.99%
Mortgage note due date	May 1, 2026
Self-storage facilities | Facility	1
Aggregate net book value of property pledged for mortgage note | $	$ 4.3
Effective interest rate	6.24%

Mortgages Payable and Debt Ma48

Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Line of credit		$ 79,000
Term notes, net of debt issuance costs	$ 1,187,770	746,650
Mortgage note, total	10,205	1,993
Interest rate derivatives - liability	22,010	$ 15,343
Line of Credit - Variable Rate LIBOR + 1.10% (1.54% at June 30, 2016) [Member]
Debt Instrument [Line Items]
Line of credit	0
Term Note - Variable Rate LIBOR+1.15% (1.61% at June 30, 2016) [Member]
Debt Instrument [Line Items]
Payable due 2020	325,000
Term notes, net of debt issuance costs	325,000
Term note, fair value	325,000
Term Note - Fixed Rate 5.54% [Member]
Debt Instrument [Line Items]
Payables due Thereafter	100,000
Term notes, net of debt issuance costs	100,000
Term note, fair value	114,096
Term Note - Fixed Rate 4.533% [Member]
Debt Instrument [Line Items]
Payables due Thereafter	175,000
Term notes, net of debt issuance costs	175,000
Term note, fair value	190,191
Term Note - Fixed Rate 3.50% [Member]
Debt Instrument [Line Items]
Payables due Thereafter	600,000
Term notes, net of debt issuance costs	600,000
Term note, fair value	606,553
Mortgage Note - Fixed Rate 5.99% [Member]
Debt Instrument [Line Items]
Payable due 2016	71
Payables due 2017	151
Payables due 2018	160
Payable due 2019	170
Payable due 2020	181
Payables due Thereafter	1,190
Mortgage note, total	1,923
Debt instrument, fair value	2,083
Mortgage Note - Fixed Rate 4.065% [Member]
Debt Instrument [Line Items]
Payable due 2016	42
Payables due 2017	88
Payables due 2018	92
Payable due 2019	96
Payable due 2020	99
Payables due Thereafter	3,832
Mortgage note, total	4,249
Debt instrument, fair value	4,255
Mortgage Note - Fixed Rate 5.26% [Member]
Debt Instrument [Line Items]
Payable due 2016	30
Payables due 2017	63
Payables due 2018	67
Payable due 2019	71
Payable due 2020	74
Payables due Thereafter	3,728
Mortgage note, total	4,033
Debt instrument, fair value	$ 4,332

Mortgages Payable and Debt Ma49

Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2016
Line of Credit - Variable Rate LIBOR + 1.10% (1.54% at June 30, 2016) [Member]
Debt Instrument [Line Items]
Interest rate at end of period	1.54%
Basis spread over LIBOR	1.10%
Term Note - Variable Rate LIBOR+1.15% (1.61% at June 30, 2016) [Member]
Debt Instrument [Line Items]
Interest rate	1.61%
Basis spread over LIBOR	1.15%
Term Note - Fixed Rate 5.54% [Member]
Debt Instrument [Line Items]
Interest rate	5.54%
Term Note - Fixed Rate 4.533% [Member]
Debt Instrument [Line Items]
Interest rate	4.533%
Term Note - Fixed Rate 3.50% [Member]
Debt Instrument [Line Items]
Interest rate	3.50%
Mortgage Note - Fixed Rate 5.99% [Member]
Debt Instrument [Line Items]
Interest rate	5.99%
Mortgage Note - Fixed Rate 4.065% [Member]
Debt Instrument [Line Items]
Interest rate	4.065%
Mortgage Note - Fixed Rate 5.26% [Member]
Debt Instrument [Line Items]
Interest rate	5.26%

Derivative Financial Instrume50

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2017	Jun. 20, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative notional amount		$ 100,000,000						$ 50,000,000
Realized loss reclassified from accumulated other comprehensive loss to interest expense	$ (1,160,000)		$ (1,359,000)	$ (2,357,000)	$ (2,718,000)
Fair value of interest rate swap agreements, liability	22,010,000			22,010,000				15,343,000
Fair value of interest rate swap agreements, asset								$ 550,000
Net termination cost	22,000,000			22,000,000
Senior Term Note Due July 1, 2026 [Member]
Derivative [Line Items]
Settlement of forward starting swap agreements loss		$ 9,200,000
Amortized period on interest expense		10 years
Interest Expense [Member]
Derivative [Line Items]
Realized loss reclassified from accumulated other comprehensive loss to interest expense	1,200,000		$ 1,400,000	2,400,000	$ 2,700,000
Unsecured Senior Notes [Member] | Senior Term Note Due July 1, 2026 [Member]
Derivative [Line Items]
Debt instrument principal amount							$ 600,000,000
Scenario, Forecast [Member] | Interest Expense [Member]
Derivative [Line Items]
Realized loss reclassified from accumulated other comprehensive loss to interest expense						$ 5,400,000
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount of variable rate debt swapped	325,000,000			325,000,000
Derivative notional amount	$ 125,000,000			$ 125,000,000

Derivative Financial Instrume51

Derivative Financial Instruments - Summary of Interest Rate Swap Agreements (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount		$ 100,000,000	$ 50,000,000
Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	$ 125,000,000
Effective Date	Sep. 1, 2011
Expiration Date	Aug. 1, 2018
Fixed Rate Paid	2.37%
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Floating Rate Received	1 month LIBOR
Interest Rate Swap One [Member]
Derivative [Line Items]
Notional Amount	$ 100,000,000
Effective Date	Dec. 30, 2011
Expiration Date	Dec. 29, 2017
Fixed Rate Paid	1.6125%
Interest Rate Swap One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Floating Rate Received	1 month LIBOR
Interest Rate Swap Two [Member]
Derivative [Line Items]
Notional Amount	$ 100,000,000
Effective Date	Sep. 4, 2013
Expiration Date	Sep. 4, 2018
Fixed Rate Paid	1.371%
Interest Rate Swap Two [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Floating Rate Received	1 month LIBOR
Interest Rate Swap Three [Member]
Derivative [Line Items]
Notional Amount	$ 100,000,000
Effective Date	Dec. 29, 2017
Expiration Date	Nov. 29, 2019
Fixed Rate Paid	3.968%
Interest Rate Swap Three [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Floating Rate Received	1 month LIBOR
Interest Rate Swap Four [Member]
Derivative [Line Items]
Notional Amount	$ 125,000,000
Effective Date	Aug. 1, 2018
Expiration Date	Jun. 1, 2020
Fixed Rate Paid	4.193%
Interest Rate Swap Four [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Floating Rate Received	1 month LIBOR

Derivative Financial Instrume52

Derivative Financial Instruments - Summary of Changes in AOCL (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accumulated other comprehensive loss beginning of period	$ (26,511)	$ (16,992)	$ (14,415)	$ (13,005)
Realized loss reclassified from accumulated other comprehensive loss to interest expense	1,160	1,359	2,357	2,718
Unrealized loss from changes in the fair value of the effective portion of the interest rate swaps	(5,512)	1,062	(18,805)	(4,284)
Loss included in other comprehensive loss	(4,352)	2,421	(16,448)	(1,566)
Accumulated other comprehensive loss end of period	$ (30,863)	$ (14,571)	$ (30,863)	$ (14,571)

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps, Asset		$ 550
Interest rate swaps, Liability	$ (22,010)	(15,343)
Interest Rate Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps, Asset		550
Interest rate swaps, Liability	(22,010)	(15,343)
Interest Rate Swap [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps, Asset		550
Interest rate swaps, Liability	$ (22,010)	$ (15,343)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Facility	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Number of storage facilities acquired	34	34
Storage Facilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Number of storage facilities acquired		34

Investment in Joint Ventures -

Investment in Joint Ventures - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016USD ($)Property	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)Property	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)Property	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)Property	Dec. 31, 2011USD ($)Property	Dec. 31, 2008USD ($)Property
Schedule of Equity Method Investments [Line Items]
Investment at carrying value	$ 67,157,000		$ 67,157,000		$ 62,520,000
Equity in income of joint ventures	$ 998,000	$ 853,000	$ 1,913,000	$ 1,499,000
Sovran HHF Storage Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in unconsolidated joint venture	20.00%		20.00%
Investment at carrying value	$ 44,100,000		$ 44,100,000		44,600,000
Payment for property acquisition						$ 187,200,000				$ 171,500,000
Number of properties owned and managed under twenty-percent stake joint venture | Property	39		39							25
Additional number of properties owned and managed under twenty-percent stake joint venture | Property						14
Contribution of company to joint venture as share in capital						$ 28,600,000		$ 1,200,000		$ 18,600,000
Receipt of return of capital distribution							$ 3,400,000
Excess of investment over net asset due to capitalization of acquisition related costs	$ 1,700,000		$ 1,700,000
Other-than-temporary impairment recorded on investment			0
Sovran HHF Storage Holdings LLC [Member] | Acquisitions 2014 [Member]
Schedule of Equity Method Investments [Line Items]
Contribution of company to joint venture as share in capital					400,000
Sovran HHF Storage Holdings II LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investment at carrying value	$ 13,800,000		$ 13,800,000		13,900,000
Payment for property acquisition								29,000,000	$ 166,100,000
Contribution of company to joint venture as share in capital					1,700,000			$ 2,400,000	$ 12,800,000
Percentage of variable interest ownership in unconsolidated joint venture			15.00%
Number of properties owned and managed under fifteen-percent stake joint venture | Property	30		30					10	20
Sovran HHF and Sovran HHF II [Member]
Schedule of Equity Method Investments [Line Items]
Management and call center fee as a percentage of revenues	7.00%
Management and call center fee earned	$ 1,300,000	1,200,000	$ 2,500,000	2,400,000
Equity in income of joint ventures	$ 900,000	800,000	$ 1,800,000	1,400,000
Iskalo Office Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in unconsolidated joint venture	49.00%		49.00%
Equity in income of joint ventures	$ 54,000	$ 46,000	$ 113,000	104,000
Investment liability at carrying value	$ (500,000)		(500,000)		(500,000)
Rent paid during the period			$ 500,000	$ 500,000
Urban Box Coralway Storage, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in unconsolidated joint venture	85.00%		85.00%
Contribution of company to joint venture as share in capital					4,000,000
Management and call center fee as a percentage of revenues			6.00%
Management and call center fee earned			$ 0		0
SNL/Orix 1200 McDonald Ave., LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in unconsolidated joint venture	5.00%		5.00%
Management and call center fee earned			$ 0		0
SNL/Orix 1200 McDonald Ave., LLC [Member] | Common Stock Shares [Member]
Schedule of Equity Method Investments [Line Items]
Contribution of company to joint venture as share in capital			400,000
SNL/Orix 1200 McDonald Ave., LLC [Member] | Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Contribution of company to joint venture as share in capital			$ 2,300,000
SNL Orix Merrick, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in unconsolidated joint venture	5.00%		5.00%
Management and call center fee earned			$ 0		$ 0
SNL Orix Merrick, LLC [Member] | Common Stock Shares [Member]
Schedule of Equity Method Investments [Line Items]
Contribution of company to joint venture as share in capital			400,000
SNL Orix Merrick, LLC [Member] | Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Contribution of company to joint venture as share in capital			$ 2,100,000

Investment in Joint Ventures 56

Investment in Joint Ventures - Summary of Unconsolidated Joint Ventures' Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investment in storage facilities, net	$ 2,435,773		$ 2,435,773		$ 2,026,507
Other assets	9,465		9,465		9,048
Total Assets	3,426,453		3,426,453		2,118,822
Mortgages payable	10,205		10,205		1,993
Other liabilities	1,700		1,700
Total Liabilities	1,265,220		1,265,220		898,336
Unaffiliated partners' equity	268		268
Company equity	2,140,774		2,140,774		1,202,315
Total Partners' Equity	2,141,042		2,141,042		$ 1,202,315
Depreciation and amortization of customer list	(18,251)	$ (14,584)	(34,676)	$ (28,766)
Amortization of financing fees			(8,035)	(592)
Income tax expense	(100)	(600)	(600)	(1,000)
Interest expense	(8,244)	$ (9,216)	(17,377)	$ (18,377)
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investment in storage facilities, net	535,791		535,791
Investment in office building, net	5,054		5,054
Other assets	17,701		17,701
Total Assets	558,546		558,546
Due to the Company	1,060		1,060
Mortgages payable	222,971		222,971
Other liabilities	6,836		6,836
Total Liabilities	230,867		230,867
Unaffiliated partners' equity	262,724		262,724
Company equity	64,955		64,955
Total Partners' Equity	327,679		327,679
Total Liabilities and Partners' Equity	$ 558,546		558,546
Total revenues			36,569
Property operating expenses			(11,881)
Administrative, management and call center fees			(2,657)
Depreciation and amortization of customer list			(6,229)
Amortization of financing fees			(177)
Income tax expense			(116)
Interest expense			(5,154)
Net income			$ 10,355

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule Of Income Taxes [Line Items]
Federal and state income tax expense	$ 100,000	$ 600,000	$ 600,000	$ 1,000,000
Unrecognized tax benefits	0	$ 0	0	0
Interest or penalties related to uncertain tax positions			0	$ 0
Current accrued taxes	600,000		600,000
Deferred tax liability	$ 1,200,000		$ 1,200,000
Tax Year 2013 [Member]
Schedule Of Income Taxes [Line Items]
Tax years open to examination			2,013
Latest Tax Year [Member]
Schedule Of Income Taxes [Line Items]
Tax years open to examination			2,015

Earnings Per Share and Earnin58

Earnings Per Share and Earnings Per Unit - Computation of Basic and Diluted Earnings Per Common Share/Unit (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income attributable to common shareholders/unitholders	$ 43,456	$ 28,532	$ 71,796	$ 50,983
Denominator:
Denominator for basic earnings per share/unit - weighted average shares/units	41,980,389	35,377,694	40,195,603	34,853,731
Effect of Dilutive Securities:
Stock options and non-vested stock	247,000	225,000	249,000	225,000
Denominator for diluted earnings per share/unit - adjusted weighted average shares/unit and assumed conversion	42,227,388	35,603,020	40,445,263	35,078,946
Basic earnings per common share/unit attributable to common shareholders/unitholders	$ 1.04	$ 0.81	$ 1.79	$ 1.46
Diluted earnings per common share/unit attributable to common shareholders/unitholders	$ 1.03	$ 0.80	$ 1.78	$ 1.45
Sovran Acquisition Limited Partnership [Member]
Numerator:
Net income attributable to common shareholders/unitholders	$ 43,456	$ 28,532	$ 71,796	$ 50,983
Denominator:
Denominator for basic earnings per share/unit - weighted average shares/units	41,980,389	35,377,694	40,195,603	34,853,731
Effect of Dilutive Securities:
Stock options and non-vested stock	247,000	225,000	249,000	225,000
Denominator for diluted earnings per share/unit - adjusted weighted average shares/unit and assumed conversion	42,227,388	35,603,020	40,445,263	35,078,946
Basic earnings per common share/unit attributable to common shareholders/unitholders	$ 1.04	$ 0.81	$ 1.79	$ 1.46
Diluted earnings per common share/unit attributable to common shareholders/unitholders	$ 1.03	$ 0.80	$ 1.78	$ 1.45

Earnings Per Share and Earnin59

Earnings Per Share and Earnings Per Unit - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities not included in the effect of dilutive securities	102,173	161,412	116,373	166,316
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities not included in the effect of dilutive securities		11,000		5,500

Shareholders' Equity - Reconcil

Shareholders' Equity - Reconciliation of Changes in Parent Company's Total Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Beginning balance			$ 1,202,315
Net proceeds from the issuance of common stock			942,150
Conversion of operating partnership units to common shares			4,795
Exercise of stock options			0
Earned portion of non-vested stock			3,757
Stock option expense	$ 35	$ 81	81	$ 117
Deferred compensation-directors			45
Adjustment to redemption value on noncontrolling redeemable Operating Partnership units			920
Net income attributable to common shareholders	43,456	28,532	71,796	50,983
Change in fair value of derivatives	(4,352)	$ 2,421	(16,448)	$ (1,566)
Dividends			(68,637)
Ending balance	$ 2,140,774		$ 2,140,774

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	May 25, 2016	Jan. 20, 2016	Jun. 30, 2016	Jun. 30, 2015	May 12, 2014
Stockholders Equity [Line Items]
Common stock shares issued under equity offering program	6,900,000	2,645,000
Common stock, price per share, public offering	$ 100	$ 105.75
Proceeds from issuance of common stock	$ 665,400,000	$ 269,700,000
Common stock value authorized under equity offering program					$ 225,000,000
Shares issued under dividend reinvestment plan			66,992	73,186
Equity Program [Member]
Stockholders Equity [Line Items]
Common stock shares issued under equity offering program				199,700
Proceeds from issuance of common stock				$ 18,000,000
Common stock, value reserved for future issuance			$ 59,300,000
Weighted average issue price of common stock				$ 91.53
Equity Program [Member] | Jefferies [Member]
Stockholders Equity [Line Items]
Offering related costs and commissions				$ 200,000

Partners' Capital - Reconciliat

Partners' Capital - Reconciliation of Change in Total Partners' Capital (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Partners Capital [Line Items]
Net proceeds from the issuance of partnership units			$ 942,150
Conversion of operating partnership units to common shares			4,795
Exercise of stock options			0
Earned portion of non-vested stock			3,757
Stock option expense	$ 35	$ 81	81	$ 117
Deferred compensation-directors			45
Adjustment to redemption value on limited partners' redeemable capital interests			920
Net income attributable to common unitholders	43,456	28,532	71,796	50,983
Change in fair value of derivatives	(4,352)	2,421	(16,448)	(1,566)
Sovran Acquisition Limited Partnership [Member]
Partners Capital [Line Items]
Beginning balance of total controlling partners' capital			1,202,315
Net proceeds from the issuance of partnership units			942,150
Conversion of operating partnership units to common shares			4,795
Exercise of stock options			0
Earned portion of non-vested stock			3,757
Stock option expense			81	117
Deferred compensation-directors			45
Adjustment to redemption value on limited partners' redeemable capital interests			920
Net income attributable to common unitholders	43,456	28,532	71,796	50,983
Change in fair value of derivatives	(4,352)	$ 2,421	(16,448)	$ (1,566)
Distributions			(68,637)
Ending balance of total controlling partners' capital	$ 2,140,774		$ 2,140,774

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)Facility	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)Facility	Jun. 30, 2015USD ($)	Aug. 04, 2016USD ($)Facility	Jul. 29, 2016USD ($)Facility
Commitment And Contingencies [Line Items]
Acquisition costs	$ 1,694	$ 788	$ 4,078	$ 1,369
LifeStorage, LP [Member]
Commitment And Contingencies [Line Items]
Number of self-storage facilities under contract to be purchased | Facility	84		84
Payment for self-storage facilities under contract	$ 1,300,000		$ 1,300,000
Acquisition costs			$ 6,300
Other Acquisition [Member]
Commitment And Contingencies [Line Items]
Number of self-storage facilities under contract to be purchased | Facility	5		5
Payment for self-storage facilities under contract	$ 49,000		$ 49,000
Other Acquisition [Member] | Subsequent Event [Member]
Commitment And Contingencies [Line Items]
Number of self-storage facilities under contract to be purchased | Facility					1	1
Payment for self-storage facilities under contract					$ 8,900	$ 8,400

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Thousands	Jul. 26, 2016USD ($)	Jul. 21, 2016USD ($)	Jul. 18, 2016USD ($)	Jul. 15, 2016USD ($)Facility	Jun. 30, 2016	Jul. 01, 2016$ / shares	Dec. 31, 2015USD ($)
Subsequent Event [Line Items]
Dividend declared, date					Jul. 1, 2016
Dividend paid, date					Jul. 26, 2016
Dividend record, date					Jul. 15, 2016
Line of credit							$ 79,000
Maturity in July 2028 [Member]
Subsequent Event [Line Items]
Line of credit facility, expiration date					Jul. 31, 2028
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend per common share | $ / shares						$ 0.95
Dividend paid	$ 43,900
Increase in depreciation expense, current year			$ 8,000
Increase in depreciation expense, next year			$ 1,000
Subsequent Event [Member] | Acquisitions 2016 [Member]
Subsequent Event [Line Items]
Number of self-storage facilities under contract to be purchased | Facility				84
Payment for self-storage facilities under contract				$ 1,300,000
Discharge of indebtedness				482,000
Line of credit				$ 482,000
Subsequent Event [Member] | Maturity in July 2028 [Member]
Subsequent Event [Line Items]
Line of credit		$ 298,000
Additional secured term note		$ 200,000
Term note stated interest rate		3.67%