Schedule of Debt Obligations (Detail) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	[1]	$ 961,957	$ 1,254,160
Unamortized debt issuance costs		(8,196)	(20,048)
Less current maturities		298,596	160,435
Total long-term debt		663,361	1,093,725
Senior Secured Notes
Debt Instrument [Line Items]
Total debt		585,424	651,784
Less current maturities		298,600	95,300
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Total debt	[2]	284,729	277,518
Variable Funding Notes
Debt Instrument [Line Items]
Total debt		$ 100,000	100,000
Senior Secured Term Loan
Debt Instrument [Line Items]
Total debt	[3]		$ 244,906

[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.

[2] During FY 2016, the Company repurchased a total of $104.9 million par value (of which $51.7 million and $53.2 million were purchased in June 2016 and July 2016, respectively) of the 1.50% Convertible Notes. See below for further details. On August 2, 2017, the Company entered into a long-term refinancing arrangement with Deutsche Bank AG for an aggregate principal amount of $300 million (refer to Note 20 for further details). In accordance with ASC 470, as the terms of the refinancing are readably determinable and the terms of the credit agreement is five years (scheduled to mature on August 2, 2022), the Company has classified the 1.50% Convertible Notes of $284.7 million as long-term debt on its June 30, 2017 condensed consolidated balance sheet.

[3] On June 30, 2017, the Company repaid the remaining outstanding principal balance of the Senior Secured Term Loan and accordingly, the Company wrote off the remaining portion of the deferred financing costs and original issue discount associated with the debt facility. See below for further details.