Long-Term Debt - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	May 03, 2019	Dec. 31, 2018	Sep. 29, 2017
Debt Disclosure [Line Items]
Interest Coverage Ratio, Maximum		3.00
Current Ratio		1.00
Document Period End Date		Mar. 31, 2019
Second Lien Facility		$ 200,000,000			$ 200,000,000	$ 200,000,000
Proceeds from Debt, Net of Issuance Costs			$ 187,800,000
Debt Instrument, Unamortized Discount		2,979,000			3,159,000	4,000,000
Unamortized Debt Issuance Expense		$ 6,102,000			6,466,000	$ 8,200,000
Debt Instrument, Discounted Percentage		98.00%
Year 2 [Member]
Debt Disclosure [Line Items]
Prepayment Premium		102.00%
Prepayment Premium, Change in Control		102.00%
Year 3 [Member]
Debt Disclosure [Line Items]
Prepayment Premium		101.00%
Prepayment Premium, Change in Control		101.00%
Revolving Credit Facility
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 450,000,000
Interest Rate at Period End		6.00%
Debt To E B I T D Ratio Maximum		3.50
Line of Credit [Member]
Debt Disclosure [Line Items]
Letters of Credit Outstanding, Amount		$ 400,000			$ 400,000
Second Lien Facility [Member]
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR		7.00%
Interest rate option two, applicable margin rate		6.00%
Second Lien Facility, Initial Interest Rate		9.50%	8.34%
Second Lien Facility, Effective Interest Rate		9.89%
Debt Instrument, Term		5 years
Minimum [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR		2.00%
Interest rate option two, applicable margin rate		3.00%
Minimum [Member] | Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.375%
Maximum [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR		3.00%
Interest rate option two, applicable margin rate		4.00%
Maximum [Member] | Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Interest Payable One [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period		1 month
Interest Payable Two [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period		3 months
Interest Payable Three [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period		6 months
Subsequent Event [Member]
Debt Disclosure [Line Items]
Debt Issuance Costs, Line of Credit Arrangements, Gross				$ 2,500,000
Current Ratio				1.00
Borrowing base, pro forma, percent				20.00%
Subsequent Event [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000,000,000
Line of Credit Facility, Current Borrowing Capacity				$ 500,000,000
Debt To E B I T D Ratio Maximum				4.00
Leverage ratio, Pro forma				2.75
Subsequent Event [Member] | Line of Credit [Member] | Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 25,000,000
Subsequent Event [Member] | Minimum [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR	0.50%
Interest rate option two, applicable margin rate	1.50%
Subsequent Event [Member] | Maximum [Member] | Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR	1.50%
Interest rate option two, applicable margin rate	2.50%