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Debt and Financing Arrangements (Bank Debt) - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Bank
Dec. 31, 2015
USD ($)
Debt Disclosure [Abstract]    
Unsecured credit facility $ 400,000  
Group of participating banks | Bank 8  
Outstanding balance under applicable credit facility [1] $ 191,400 $ 205,800
Available funds under credit facility $ 137,500  
[1] See Note 1, Organization and Summary of Significant Accounting Policies, to the accompanying consolidated financial statements for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17.