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Debt and Financing Arrangements (Bank Debt) - Additional Information (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Bank
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Unsecured credit facility $ 400,000  
Group of participating banks | Bank 8  
Outstanding balance under applicable credit facility [1] $ 235,500 $ 205,800
Approximately available funds under credit facility 84,500  
Letter of Credit and Performance Guarantee [Member]    
Debt Instrument [Line Items]    
Outstanding letters of credit and performance guarantees 2,300  
Credit Facility [Member]    
Debt Instrument [Line Items]    
Unsecured credit facility $ 400,000  
[1] See Note 15 to accompanying consolidated financial statements for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 15).