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Detail of Certain Balance Sheet Accounts - Current and Long-Term Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]      
Balance at beginning of year $ 5,226 $ 6,174  
Charged to bad debt expense (recoveries of bad debt expense) (543) 224 $ 1,411
Deductions for uncollectible receivables written off, net of recoveries (1,931) (1,172)  
Balance at end of year $ 2,752 $ 5,226 $ 6,174