Summary of Future Payments under Notes and Senior Secured Credit Facilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014	Jun. 18, 2013
Debt Instrument [Line Items]
Total		$ 692,058		$ 645,535
2016		12,683
2017		15,625
2018		28,125
2019		40,625
2020		595,000
1.25% Cash Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Total		345,000	[1]	345,000	$ 345,000
2016	[1]	0
2017	[1]	0
2018	[1]	0
2019	[1]	0
2020	[1]	345,000
Term Loan [Member]
Debt Instrument [Line Items]
Total		246,875
2016		12,500
2017		15,625
2018		28,125
2019		40,625
2020		150,000
Other Debt [Member]
Debt Instrument [Line Items]
Total		183		$ 0
2016		183
2017		0
2018		0
2019		0
2020		0
Revolving Facility [Member]
Debt Instrument [Line Items]
Total		100,000
2016		0
2017		0
2018		0
2019		0
2020		$ 100,000

[1] Assumes no cash conversions of the 1.25% Notes prior to their maturity on July 1, 2020.