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Summary of Significant Accounting Policies - Common Stock Stock Options and Convertible Stock Anti-Dilutive to Earnings Excluded from Weighted Average Shares Used in Computation of Earning Per Share (Detail) shares in Thousands, EquityUnit in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 EquityUnit $ / shares $ / EquityUnit shares	Jun. 30, 2017 EquityUnit $ / shares $ / EquityUnit shares	Jun. 30, 2018 EquityUnit $ / shares $ / EquityUnit shares	Jun. 30, 2017 EquityUnit $ / shares $ / EquityUnit shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average warrants for common stock | shares	116	433	167	511
Weighted average PSUs | EquityUnit	514	313	466	273
Weighted average grant date fair value per unit | $ / EquityUnit	13.83	17.12	13.83	17.12
Weighted average contingently convertible shares | shares	40,017	36,181	39,617	36,331
Warrants for Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average exercise price per share | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Contingently Convertible Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average exercise price per share | $ / shares	$ 12.32	$ 12.32	$ 12.32	$ 12.32

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