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Credit Agreement - Schedule of Credit Agreements (Detail) - Credit Agreement [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Credit Agreement:    
Credit facility remaining availability $ 89,930 $ 86,403
Outstanding letters of credit [1],[2] 5,070 8,597
Availability of additional letters of credit [3] $ 54,930 51,403
Weighted average daily revolving credit borrowings for the year ended   $ 19
Weighted average annual interest rate 0.00% 1.93%
Commitment fee rate 0.25% 0.25%
Letter of credit fee rate [4] 0.75% 0.75%
[1] As of December 31, 2017 and 2016, outstanding letters of credit not related to the Credit Agreement totaled $0.8 million and $1.4 million, respectively, which amount is fully collateralized with restricted cash, which is in addition to the $5.1 million and $8.6 million, respectively, referenced in this Note 10.
[2] Represents letters of credit which are fully collateralized with $5.1 million and $8.6 million of restricted short-term investments as of December 31, 2017 and 2016, respectively.
[3] The letters of credit sublimit of $60.0 million under the Credit Agreement is part of, not in addition to, the $95.0 million aggregate commitments.
[4] Certain outstanding letters of credit in the above table originating after October 31, 2014 carry a fee rate of 1.50%