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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Other Liabilities Disclosure [Abstract]      
Deferred rent $ 82,459   $ 63,854
Postretirement benefit obligations 127,193   123,492
Other 40,389   40,593
Total other long-term liabilities 250,041   227,939
Long-term disability obligation 22,500   22,500
Aquilent      
Business Acquisition [Line Items]      
Acquisition-related contingent consideration $ 3,600 $ 3,576 $ 3,600