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Stockholders' Equity (Deficit) - Summary of Activity for Outstanding Three-year PSU Awards (Detail) - PSU Awards - USD ($) $ in Millions		12 Months Ended
	May 18, 2017	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)		662,931
Granted (in shares)		171,585
Converted (in shares)		(176,169)
Forfeited or expired (in shares)		(14,491)
Outstanding at end of period (in shares)		643,856
Aggregate Intrinsic Value, converted		$ 7.5
Fully vested at end of period (in shares)		426,649
Aggregate Intrinsic Value, Fully vested at end of period		$ 14.9
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Performance units granted percentage		200.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Performance units granted percentage		0.00%

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Net number of non-option equity instruments granted to participants.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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