Related Party Transactions - Schedule of Consolidated Balance Sheet Related to Services Provided to Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Contract assets	$ 583,670	$ 515,319
Contract liabilities	231,032	208,576
Unconsolidated Joint Ventures
Related Party Transaction [Line Items]
Accounts receivable	44,637	38,742
Contract assets	2,734	2,648
Contract liabilities	$ 5,517	$ 10,861

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant