Summary of Significant Accounting Policies (Current and Long-Term Accounts and Notes Receivable and Allowance for Doubtful Accounts) - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Receivables [Abstract]
Number of days after accounts receivable are treated as delinquent	30 days	30 days
Number of days related to outstanding accounts receivable for analysis of the allowance for doubtful accounts	At least 90 days
Allowances for doubtful accounts on current receivable	$ 2,719	$ 5,226
Current retainage balances	221,000	250,100
Non-current retainage balances	4,400	4,500
Unbilled receivables	$ 228,000	$ 233,600