Financial Instruments and Fair Value Disclosures - Additional Information (Detail)		1 Months Ended	12 Months Ended
	Oct. 18, 2016	Oct. 18, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) Customer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bad debt expense			$ 0	$ 0	$ 0
Receivables written off					21,148,000
Transfers between fair value levels			$ 0	0
Measurement period for determining fair value of debt instruments			10 days
Level 1 [Member] | Cash Held in Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments			$ 125,700,000	85,200,000
Level 1 [Member] | Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments			20,600,000	$ 20,400,000
Niko [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount receivable under settlement agreement			28,000,000			$ 80,000,000
Cash received pursuant to Settlement Agreement		$ 49,000,000
Percentage of future payments of amounts to be retained pursuant to waterfall distribution under credit facility	20.00%
Cash proceeds from legal settlements			$ 3,000,000
OGX and Niko Resources [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of customers | Customer						2
Bad debt expense						$ 22,500,000
OGX Petroleo e Gas Ltda. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables written off					$ 21,200,000