Fair Value Measurements - Additional Disclosures (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Cash equivalents	$ 0			$ 0		$ 0
Impairment to rental equipment		$ 2,300,000
Impairments of goodwill or other intangible assets	$ 0		$ 0	$ 0	$ 0