Summary of Significant Accounting Policies - Summary of Reconciliation of Amounts in Previously Reported Consolidated Financial Statements - Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Quantifying Misstatement In Current Year Financial Statements [Line Items]
Net loss	$ 26,847	$ (45,534)
Accounts receivable	10,478	10,447
Accounts payable and accrued liabilities	$ (14,992)	(27,457)
As Reported [Member]
Quantifying Misstatement In Current Year Financial Statements [Line Items]
Net loss		(40,687)
Accounts receivable		10,619
Accounts payable and accrued liabilities		(32,476)
Adjustment [Member]
Quantifying Misstatement In Current Year Financial Statements [Line Items]
Net loss		(4,847)
Accounts receivable		(172)
Accounts payable and accrued liabilities		$ 5,019