Real Estate Assets and Construction in Progress - Summary of Properties Owned by the Operating Partnership (Detail) (QualityTech, LP [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Real Estate Properties [Line Items]
Land	$ 30,518	$ 24,713
Buildings and improvements	711,238	622,506
Construction in Progress	106,630	87,609
Total Cost	848,386	734,828
Owned Properties [Member]
Real Estate Properties [Line Items]
Land	30,518	24,713
Buildings and improvements	690,925	603,121
Construction in Progress	103,801	85,721
Total Cost	825,244	713,555
Owned Properties [Member] | Suwanee, Georgia (Atlanta-Suwanee) [Member]
Real Estate Properties [Line Items]
Land	3,521	3,521
Buildings and improvements	118,473	103,438
Construction in Progress	6,031	3,572
Total Cost	128,025	110,531
Owned Properties [Member] | Atlanta, Georgia (Atlanta-Metro) [Member]
Real Estate Properties [Line Items]
Land	15,314
Buildings and improvements	294,124
Construction in Progress	9,076
Total Cost	318,514
Owned Properties [Member] | Santa Clara, California [Member]
Real Estate Properties [Line Items]
Land
Buildings and improvements	85,832	83,536
Construction in Progress	822	245
Total Cost	86,654	83,781
Owned Properties [Member] | Richmond, Virginia [Member]
Real Estate Properties [Line Items]
Land	2,180	2,179
Buildings and improvements	107,548	71,629
Construction in Progress	64,343	71,986
Total Cost	174,071	145,794
Owned Properties [Member] | Sacramento, California [Member]
Real Estate Properties [Line Items]
Land	1,481	1,485
Buildings and improvements	52,725	52,753
Construction in Progress	2,796
Total Cost	57,002	54,238
Owned Properties [Member] | Dallas, Texas [Member]
Real Estate Properties [Line Items]
Land	5,808
Buildings and improvements
Construction in Progress	20,733
Total Cost	26,541
Owned Properties [Member] | Miami, Florida [Member]
Real Estate Properties [Line Items]
Land	1,777	1,777
Buildings and improvements	27,499	27,111
Construction in Progress
Total Cost	29,276	28,888
Owned Properties [Member] | Lenexa, Kansas [Member]
Real Estate Properties [Line Items]
Land	437	437
Buildings and improvements	3,317	54
Construction in Progress		3,260
Total Cost	3,754	3,751
Owned Properties [Member] | Wichita, Kansas [Member]
Real Estate Properties [Line Items]
Land
Buildings and improvements	1,407	1,408
Construction in Progress
Total Cost	1,407	1,408
Owned Properties [Member] | Atlanta, Georgia (Atlanta-Metro) [Member]
Real Estate Properties [Line Items]
Land		15,314
Buildings and improvements		263,192
Construction in Progress		6,658
Total Cost		285,164
Leased Properties [Member]
Real Estate Properties [Line Items]
Land
Buildings and improvements	20,313	19,385
Construction in Progress	2,829	1,888
Total Cost	23,142	21,273
Leased Properties [Member] | Jersey City, New Jersey [Member]
Real Estate Properties [Line Items]
Land
Buildings and improvements	19,574	18,666
Construction in Progress	2,829	1,888
Total Cost	22,403	20,554
Leased Properties [Member] | Overland Park, Kansas [Member]
Real Estate Properties [Line Items]
Land
Buildings and improvements	739	719
Construction in Progress
Total Cost	$ 739	$ 719