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Indebtedness - Summary Information Concerning Indebtedness (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Outstanding Principal | $ 2,489,379,000 | $ 2,650,743,000
Unamortized Debt Issuance Costs | (16,123,000) | (16,993,000)
Unamortized Loan (Discount)/Premiums | 68,832,000 | 71,586,000
Carrying Amount | $ 2,542,088,000 | $ 2,705,336,000
Weighted Average Rate | 3.40% | 3.20%
Weighted Average Maturity (in years) | 5 years 4 months 24 days | 5 years 7 months 6 days
Unsecured revolver |  |
Debt Instrument [Line Items] |  |
Outstanding Principal | $ 117,503,000 | $ 277,003,000
Unamortized Debt Issuance Costs | (2,770,000) | (2,894,000)
Unamortized Loan (Discount)/Premiums | 0 | 0
Carrying Amount | $ 114,733,000 | $ 274,109,000
Weighted Average Rate | 1.70% | 1.50%
Weighted Average Maturity (in years) | 3 years 9 months 18 days | 4 years 1 month 6 days
Credit facility borrowing capacity | $ 500,000,000 | $ 500,000,000
Unsecured term loans |  |
Debt Instrument [Line Items] |  |
Outstanding Principal | 500,000,000 | 500,000,000
Unamortized Debt Issuance Costs | (1,897,000) | (2,049,000)
Unamortized Loan (Discount)/Premiums | 0 | 0
Carrying Amount | $ 498,103,000 | $ 497,951,000
Weighted Average Rate | 1.60% | 1.40%
Weighted Average Maturity (in years) | 2 years 10 months 24 days | 3 years 2 months 12 days
Secured credit facilities |  |
Debt Instrument [Line Items] |  |
Outstanding Principal | $ 635,128,000 | $ 635,128,000
Unamortized Debt Issuance Costs | (2,660,000) | (2,840,000)
Unamortized Loan (Discount)/Premiums | 31,178,000 | 32,330,000
Carrying Amount | $ 663,646,000 | $ 664,618,000
Weighted Average Rate | 4.00% | 4.00%
Weighted Average Maturity (in years) | 6 years 8 months 12 days | 6 years 10 months 24 days
Mortgages |  |
Debt Instrument [Line Items] |  |
Outstanding Principal | $ 1,236,748,000 | $ 1,238,612,000
Unamortized Debt Issuance Costs | (8,796,000) | (9,210,000)
Unamortized Loan (Discount)/Premiums | 37,654,000 | 39,256,000
Carrying Amount | $ 1,265,606,000 | $ 1,268,658,000
Weighted Average Rate | 3.90% | 3.90%
Weighted Average Maturity (in years) | 5 years 10 months 24 days | 6 years 2 months 12 days

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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