Derivative Financial Instruments - Summary of Notional Values and Fair Values of Derivative Financial Instruments (Detail) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016 |
Derivative [Line Items] | | |
Derivative assets, at fair value | $ 2,511,000 | $ 2,143,000 |
Derivative liability, at fair value | (945,000) | $ (1,300,000) |
Cash Flow Hedging | Designated as Hedging Instrument | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | 185,000,000 | |
Derivative liability, notional amount | 85,000,000 | |
Derivative assets, at fair value | 2,511,000 | |
Derivative liability, at fair value | (945,000) | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.4600 % Swap Rate, Expiration Date 05/2020 | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | $ 50,000,000 | |
Fixed rate (as a percent) | 1.46% | |
Derivative assets, at fair value | $ 330,000 | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.4980 % Swap Rate, Expiration Date 05/2021 | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | $ 20,000,000 | |
Fixed rate (as a percent) | 1.498% | |
Derivative assets, at fair value | $ 250,000 | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.4900 % Swap Rate, Expiration Date 05/2021 | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | $ 15,000,000 | |
Fixed rate (as a percent) | 1.49% | |
Derivative assets, at fair value | $ 192,000 | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.4800 % Swap Rate, Expiration Date 05/2021 | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | $ 40,000,000 | |
Fixed rate (as a percent) | 1.48% | |
Derivative assets, at fair value | $ 553,000 | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.7700 % Swap Rate, Expiration Date 05/2023 | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | $ 60,000,000 | |
Fixed rate (as a percent) | 1.77% | |
Derivative assets, at fair value | $ 1,186,000 | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 2.0480 % Swap Rate, Expiration Date 10/2018 | | |
Derivative [Line Items] | | |
Derivative liability, notional amount | $ 30,000,000 | |
Fixed rate (as a percent) | 2.048% | |
Derivative liability, at fair value | $ (344,000) | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.8500 % Swap Rate, Expiration Date 10/2018 | | |
Derivative [Line Items] | | |
Derivative liability, notional amount | $ 25,000,000 | |
Fixed rate (as a percent) | 1.85% | |
Derivative liability, at fair value | $ (186,000) | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 1.8400 % Swap Rate, Expiration Date 10/2018 | | |
Derivative [Line Items] | | |
Derivative liability, notional amount | $ 5,000,000 | |
Fixed rate (as a percent) | 1.84% | |
Derivative liability, at fair value | $ (41,000) | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 2.1500 % Swap Rate, Expiration Date 05/2020 | | |
Derivative [Line Items] | | |
Derivative liability, notional amount | $ 15,000,000 | |
Fixed rate (as a percent) | 2.15% | |
Derivative liability, at fair value | $ (228,000) | |
Cash Flow Hedging | Designated as Hedging Instrument | Unsecured term loan facility with: 2.1500 % Swap Rate, Expiration Date 05/2020 | | |
Derivative [Line Items] | | |
Derivative liability, notional amount | $ 10,000,000 | |
Fixed rate (as a percent) | 2.15% | |
Derivative liability, at fair value | $ (146,000) | |
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap | | |
Derivative [Line Items] | | |
Derivative asset, notional amount | 125,000,000 | |
Derivative assets, at fair value | $ 1,325,000 | |