Fair Value Measurement - Additional Information (Detail) - USD ($)		3 Months Ended												12 Months Ended
	Jan. 05, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets or liabilities measured with fair value		$ 80,651,000				$ (120,848,000)								$ 80,651,000	$ (120,848,000)
Expected volatility rate														40.00%	40.00%
Risk free interest rate														0.60%	0.60%
Expected probability of occurrence														90.00%	90.00%
Mandatory conversion, expected term														6 months	12 months
Net income (loss) attributable to common and participating stockholders		$ 135,886,000	$ (21,145,000)	$ 17,909,000	$ 51,050,000	$ 5,568,000	$ (8,419,000)	$ (77,983,000)	$ 1,253,000	$ (9,573,000)	$ (1,299,000)	$ 17,322,000	$ (12,835,000)	$ 183,700,000	$ (79,581,000)	$ (6,385,000)
Maximum [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Percentage of closing stock price														10.00%
Estimated net income														$ 23,200,000
Maximum [Member] | Volatility Assumption [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Percentage of closing stock price														10.00%
Maximum [Member] | Transaction Occurring Assumption [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Percentage of closing stock price														10.00%
Estimated net income														$ 9,000,000
Minimum [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Percentage of closing stock price														10.00%
Estimated net income														$ 30,400,000
Minimum [Member] | Volatility Assumption [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Percentage of closing stock price														10.00%
Estimated net income														$ 5,400,000
Estimated net income														$ 900,000
Minimum [Member] | Transaction Occurring Assumption [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Percentage of closing stock price														10.00%
Estimated net income														$ 9,000,000
Redeemable Convertible Series B Preferred Stock [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Capital	$ 600,000,000
Redeemable Convertible preferred stock, shares issued	600,000	600,000				600,000				0				600,000	600,000	0
Preferred stock liquidation preference per share	$ 1,000
Preferred stock dividend rate calculated on interest rate	3.00%
Conversion floor price of common stock		$ 1.75												$ 1.75
Redeemable Convertible Series B Preferred Stock [Member] | Maximum [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Common stock value per share		$ 2.25												$ 2.25
Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets or liabilities measured with fair value										$ 0						$ 0