Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	$ (48)
Amounts reclassified from accumulated other comprehensive loss	443
Net period other comprehensive loss	395
Accumulated Other Comprehensive Loss Attributable to InfraREIT, Inc.
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	(37)
Amounts reclassified from accumulated other comprehensive loss	341
Net period other comprehensive loss	304
Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	(11)
Amounts reclassified from accumulated other comprehensive loss	102
Net period other comprehensive loss	$ 91