Summary Quarterly Financial Data - Summary of Quarterly Financial Data (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs		$ 20,348		$ 20,905	$ 461	$ 29,858
Long-term debt		$ 260,000
Severance costs	$ 2,001			2,001
Restructuring and other related costs incurred			$ 10,371
Separation costs			$ 2,574	$ 0	$ 2,574	$ 0