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Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) ft² | Sep. 30, 2015 USD ($) ft² | Jul. 25, 2014 ft²
Business Acquisition [Line Items] |  |  |
Total Purchase Price | $ 40,900 | $ 71,248 |
Acquisition Expenses | 179 | 518 |
Annualized GAAP Rent | 3,367 | 7,380 |
Debt Issued | $ 24,000 | $ 39,579 |
Square Footage (unaudited) | ft² | 226,286 | 429,427 | 81,371
Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | $ (3,090) | $ (5,257) |
Above Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (1,672) |
Below Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (281) | (1,246) |
Salt Lake City UT [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price | 17,000 | 22,200 |
Acquisition Expenses | 105 | 149 |
Annualized GAAP Rent | 1,393 | 2,411 |
Debt Issued | $ 9,900 | $ 13,000 |
Acquisition Date | May 26, 2016 | May 29, 2015 |
Square Footage (unaudited) | ft² | 107,062 | 86,409 |
Salt Lake City UT [Member] | Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | $ (1,675) | $ (1,678) |
Salt Lake City UT [Member] | Above Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (821) |
Salt Lake City UT [Member] | Below Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (30) | (53) |
Richardson, TX [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price |  | 24,700 |
Acquisition Expenses |  | 112 |
Annualized GAAP Rent |  | 2,708 |
Debt Issued |  | $ 14,573 |
Acquisition Date |  | Mar. 06, 2015 |
Square Footage (unaudited) | ft² |  | 155,984 |
Richardson, TX [Member] | Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | $ (1,929) |
Richardson, TX [Member] | Above Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (807) |
Richardson, TX [Member] | Below Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | 0 |
Birmingham, AL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price |  | 3,648 |
Acquisition Expenses |  | 76 |
Annualized GAAP Rent |  | $ 333 |
Acquisition Date |  | Mar. 20, 2015 |
Square Footage (unaudited) | ft² |  | 30,850 |
Birmingham, AL [Member] | Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | $ (360) |
Birmingham, AL [Member] | Above Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | 0 |
Birmingham, AL [Member] | Below Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | 0 |
Fort Lauderdale, FL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price | 23,900 |  |
Acquisition Expenses | 74 |  |
Annualized GAAP Rent | 1,974 |  |
Debt Issued | $ 14,100 |  |
Acquisition Date | Sep. 12, 2016 |  |
Square Footage (unaudited) | ft² | 119,224 |  |
Fort Lauderdale, FL [Member] | Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | $ (1,415) |  |
Fort Lauderdale, FL [Member] | Below Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (251) |  |
Land [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (7,125) | (10,235) |
Land [Member] | Salt Lake City UT [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (3,008) | (3,248) |
Land [Member] | Richardson, TX [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (2,728) |
Land [Member] | Birmingham, AL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (650) |
Land [Member] | Fort Lauderdale, FL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (4,117) |  |
Building [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (22,934) | (37,508) |
Building [Member] | Salt Lake City UT [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (8,973) | (11,861) |
Building [Member] | Richardson, TX [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (12,591) |
Building [Member] | Birmingham, AL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (1,683) |
Building [Member] | Fort Lauderdale, FL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (13,961) |  |
Tenant Improvements [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (3,240) | (6,863) |
Tenant Improvements [Member] | Salt Lake City UT [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (1,685) | (1,268) |
Tenant Improvements [Member] | Richardson, TX [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (2,781) |
Tenant Improvements [Member] | Birmingham, AL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (351) |
Tenant Improvements [Member] | Fort Lauderdale, FL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (1,555) |  |
In-Place Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (3,355) | (6,808) |
In-Place Leases [Member] | Salt Lake City UT [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (1,352) | (2,396) |
In-Place Leases [Member] | Richardson, TX [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (2,060) |
In-Place Leases [Member] | Birmingham, AL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (458) |
In-Place Leases [Member] | Fort Lauderdale, FL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (2,003) |  |
Leasing Costs [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (1,437) | (4,151) |
Leasing Costs [Member] | Salt Lake City UT [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | (337) | (981) |
Leasing Costs [Member] | Richardson, TX [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | (1,804) |
Leasing Costs [Member] | Birmingham, AL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired |  | $ (146) |
Leasing Costs [Member] | Fort Lauderdale, FL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of acquired assets related to the properties acquired | $ (1,100) |  |

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