Company's Debt Maturities on Calendar Year Basis (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Total	$ 970,153
July 1 through December 31, 2017	177,249
2018	427,422
2019	42,693
2020	42,693
2021	42,693
Thereafter	237,403
Senior Secured Notes
Debt Instrument [Line Items]
Total	585,424
July 1 through December 31, 2017	177,249
2018	42,693
2019	42,693
2020	42,693
2021	42,693
Thereafter	237,403
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Total	284,729	[1]
2018	284,729	[1]
Variable Funding Notes
Debt Instrument [Line Items]
Total	100,000
2018	$ 100,000

[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the unaudited condensed consolidated balance sheet as of June 30, 2017, in accordance with accounting for convertible notes. After taking into effect the $104.9 million of repurchases of the 1.50% Convertible Notes as discussed above, the remaining principal amount owed to the holders of the 1.50% Convertible Notes is $295.1 million.