Fair Value Measurements - Nonrecurring Fair Value Measurements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment losses	$ (46,600,000)	$ 0	$ 0
Long-term growth rate	8 years
Performance Solutions | Offshore Solutions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment losses	$ (46,600,000)
Long-term growth rate	5 years
Annual revenue growth rates	3.00%
Discount rate	9.00%
Performance Solutions | Offshore Solutions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual revenue growth rates	(1.20%)
Performance Solutions | Offshore Solutions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual revenue growth rates	3.90%
Significant unobservable inputs (Level 3) | Performance Solutions | Offshore Solutions | Nonrecurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill fair value	$ 276,000,000