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Unsecured Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | May 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of senior notes |  |  |  |  |  | $ 958,509 | $ 240,000
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured term loan | $ 400,000 | $ 400,000 |  |  |  | $ 400,000 |
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Specified spread line of credit facility | 1.10% |  |  |  |  |  |
3.9% Senior Unsecured Notes Due August 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes issued |  |  | $ 350,000 |  |  |  |
Debt instrument interest rate |  |  | 3.90% |  |  |  |
Debt instrument maturity date |  |  | 2024-08 |  |  |  |
Debt instrument, unamortized discount |  |  | $ 1,000 |  |  |  |
Debt instrument, issuance costs |  |  | $ 2,900 |  |  |  |
4.7% Senior Unsecured Notes Due June 2027 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes issued |  |  |  |  | $ 450,000 |  |
Debt instrument interest rate |  |  |  |  | 4.70% |  |
Debt instrument maturity date |  |  |  |  | 2027-06 |  |
Debt instrument, unamortized discount |  |  |  |  | $ 800 |  |
Debt instrument, issuance costs |  |  |  |  | $ 4,000 |  |
4.75% Senior Unsecured Notes Due April 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  | 4.75% |  |  |
Debt instrument maturity date |  |  |  | 2018-04 |  |  |
Repayment of senior notes |  |  |  | $ 300,000 |  |  |
Payment on redemption of senior notes |  |  |  | $ 7,300 |  |  |
7.875% Senior Unsecured Notes Due September 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 7.875% | 7.875% |  |  |  | 7.875% |
Debt instrument maturity date |  | 2020-09 |  |  |  |  |
Repayment of senior notes |  | $ 300,000 |  |  |  |  |
Payment on redemption of senior notes |  | 51,200 |  |  |  |  |
Tranche A Loans [Member] | Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured term loan | $ 200,000 | $ 200,000 |  |  |  | $ 200,000 |
Term loan maturity date |  | 2018-01 |  |  |  |  |
Extension maturity period |  | with two one-year extension options |  |  |  |  |
Tranche B Loans [Member] | Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured term loan | $ 200,000 | $ 200,000 |  |  |  | $ 200,000 |
Term loan maturity date |  | 2023-01 |  |  |  |  |

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