Accounts Receivable, Net of Reserve for Doubtful Receivables - Additional Information (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Gross accounts receivable	$ 630,784,000	$ 601,667,000
Reserve for doubtful receivables	15,519,000	11,530,000	$ 15,192,000	$ 16,560,000
Net accounts receivable	615,265,000	590,137,000
Accounts receivable due after one year	3,272,000	8,348,000
Accounts receivable from related parties	2,490,000	1,980,000
Reserve for doubtful receivables from related parties	$ 0	$ 0