Commitments and Contingencies - Contracts Acquired in the Central Merger (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Structural or other improvement and repair costs incurred	$ 0.1	$ 0.1
Estimated total structural and other improvement and repair costs related to lease contracts acquired in the Central Merger	$ 1.5
Expected recovery through applicable indemnity of cost incurred expressed as percentage of total cost	80.00%

Represents the amount of expected recovery through applicable indemnity of certain structural or other improvement and repair costs incurred, expressed a percentage of total cost.

No definition available.

Name:	sp_ExpectedRecoveryOfCostIncurredExpressedAsPercentageOfTotalCostThroughApplicableIndemnity
Namespace Prefix:	sp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration