Summary Quarterly Financial Data - Summary of Quarterly Financial Data (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Restructuring and other related costs incurred	$ 10,371
Separation costs	2,574		2,574
Fees related to termination of 2009 Advisory Agreement		50,072		50,072
Loss on early extinguishment of debt and write-off of discounts and deferred financing costs		$ 29,858	$ 461	$ 29,858	$ 2,053