Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Contingencies And Commitments [Line Items]
Net profits interest percent		27.00%
Disgorgement claims, limit		$ 17,000,000
Deductible for marine liability coverage including personal injury claims, per first occurrence		10,000,000
Range of deductible for liability coverage for personal injury claims, lower limit		5,000,000
Range of deductible for liability coverage for personal injury claims, upper limit		100,000,000
Purchase obligations		0
Rental expense under operating leases		5,500,000	$ 7,800,000	$ 10,600,000
Future minimum rental payments under leases, in current years		1,800,000
Future minimum rental payments under leases, in two years		500,000
Future minimum rental payments under leases, in three years		100,000
Future minimum rental payments under leases, in four years		100,000
Future minimum rental payments under leases, in five years		100,000
Future minimum rental payments under leases, thereafter		$ 32,000
Maturity of lease agreement	10 years	10 years
Total Contingent Liabilities Under Letters of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds		$ 57,200,000
Potentially Collateralized Contingent Liability Under Letters Of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds		53,900,000
NPI Arrangement [Member]
Contingencies And Commitments [Line Items]
Payments received from customer after bankruptcy filing		3,250,000
Payments received from customer before and after bankruptcy filing		30,000,000
Personal Injury Claims [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded		32,900,000	40,400,000
Personal Injury Claims [Member] | Accrued Liabilities [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded		6,100,000	8,200,000
Personal Injury Claims [Member] | Other Liabilities [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded		26,800,000	$ 32,200,000
Windstorms in U.S. Gulf of Mexico [Member]
Contingencies And Commitments [Line Items]
Deductible for marine liability coverage including personal injury claims, per first occurrence		25,000,000
Range of deductible for liability coverage for personal injury claims, lower limit		25,000,000
Range of deductible for liability coverage for personal injury claims, upper limit		$ 100,000,000