Revenue from Contracts with Customers - Summary of Impact on Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, less allowances	$ 582,524	$ 528,250
Accrued liabilities	$ 262,233	280,666
Effect of Change | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, less allowances		100,190
Accrued liabilities		100,190
Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, less allowances		428,060
Accrued liabilities		$ 180,476