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Revenues - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Accounts receivable balances	$ 596,888,000	$ 580,354,000
ASC Topic 606 Revenue from Contracts with Customers
Disaggregation Of Revenue [Line Items]
Accounts receivable balances	593,000,000	577,000,000
ASC Topic 606 Revenue from Contracts with Customers | Customer Prepayments
Disaggregation Of Revenue [Line Items]
Contract liability balances included in accounts payable	1,800,000	9,100,000
ASC Topic 606 Revenue from Contracts with Customers | Deferred Mobilization Payments
Disaggregation Of Revenue [Line Items]
Contract liability balances included in accounts payable	4,300,000	$ 4,700,000
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling
Disaggregation Of Revenue [Line Items]
Mobilization payments received for initial rig moves that relate to new contracts	$ 405,000
Maximum
Disaggregation Of Revenue [Line Items]
Accounts receivable payment terms	60 days
Performance obligation original expected duration	1 year
Minimum
Disaggregation Of Revenue [Line Items]
Accounts receivable payment terms	30 days

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