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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
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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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