Summary of Significant Accounting Policies - Additional Information 3 (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Jurisdictions shares	Mar. 31, 2015 USD ($)	Dec. 31, 2015 shares
Operations And Summary Of Significant Accounting Policies [Line Items]
Customary rate	35.00%	35.00%
State jurisdiction currently under review | Jurisdictions	1
Cumulative common stock ownership change over three year period that could limit federal and state net operating loss carry forwards	50.00%
Rights Plan establishment date	Oct. 31, 2015
Performance multiplier, minimum	0.00%
Performance multiplier, maximum	200.00%
Interest costs, capitalized during period	$ 0	$ 900,000
Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding | shares	1,822,604		1,570,302
Fixed Rate Debt
Operations And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, including current portion, Carrying Value	$ 1,200,000,000
Level 2 | Fixed Rate Debt
Operations And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, including current portion, Fair Value	$ 415,400,000