Company's Debt Maturities on Calendar Year Basis (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Total	$ 1,274,208
2017	160,435
2018	450,203
2019	72,685
2020	72,685
2021	192,359
Thereafter	325,841
Senior Secured Notes
Debt Instrument [Line Items]
Total	651,784
2017	95,203
2018	57,685
2019	57,685
2020	57,685
2021	57,685
Thereafter	325,841
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Total	277,518	[1]
2018	277,518	[1]
Variable Funding Notes
Debt Instrument [Line Items]
Total	100,000
2018	100,000
Senior Secured Term Loan
Debt Instrument [Line Items]
Total	244,906	[2]
2017	65,232	[2]
2018	15,000	[2]
2019	15,000	[2]
2020	15,000	[2]
2021	$ 134,674	[2]

[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the consolidated balance sheet as of December 31, 2016, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 1.50% Convertible Notes is $295.1 million.

[2] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the consolidated balance sheet as of December 31, 2016. The actual principal outstanding balance of the Senior Secured Term Loan is $263.7 million as of December 31, 2016.