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Share-Based Compensation - Schedule of Information with Respect to all Outstanding Restricted Stock (Detail) - Restricted Stock Units [Member] - $ / shares

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Beginning balance of Outstanding, Units

2,017,477

^[1]

1,453,823

1,712,204

Granted, Units

427,488

1,397,644

289,392

Vested, Units

(500,818)

(709,132)

(422,284)

^[2]

Forfeited, Units

(22,955)

(124,858)

(125,489)

Ending balance of Outstanding, Units

1,921,192

2,017,477

^[1]

1,453,823

Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit

$ 12.70

^[1]

$ 5.32

$ 4.63

Granted, Weighted Average Grant-Date Fair Value Per Unit

21.31

12.91

8.49

Vested, Weighted Average Grant-Date Fair Value Per Unit

6.14

4.97

4.64

^[2]

Forfeited, Weighted Average Grant-Date Fair Value Per Unit

11.42

7.14

5.56

Ending balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit

$ 16.34

$ 12.70

^[1]

$ 5.32

[1]	The weighted average grant-date fair value per unit as of December 31, 2018 reflects an adjusted fair value per unit from $10.59 to $12.70 due to the modification of grants approved by the Board of Directors during the current year for our performance-based awards granted on December 14, 2018.
[2]	The total vested awards include 6.3 thousand of vested restricted stock units settled in cash for the year ended December 31, 2017. These awards granted in 2015 for retention purposes are subject to accelerated vesting and cash settlement in the event of an involuntary not-for-cause termination of employment by the Company.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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