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Share-Based Compensation - Schedule of Information with Respect to all Outstanding Restricted Stock and Restricted Stock Units (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance of Outstanding Shares	1,712,204		757,871		598,892
Granted, Shares	289,392		1,555,828		808,898
Vested, Shares	(422,284)	[1]	(381,850)	[1]	(237,578)
Forfeited, Shares	(125,489)		(219,645)		(412,341)
Ending balance of Outstanding Shares	1,453,823		1,712,204		757,871
Restricted Stock Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance of Outstanding Shares					42,752
Vested, Shares					(39,969)
Forfeited, Shares					(2,783)
Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Share					$ 21.63
Vested, Weighted Average Grant-Date Fair Value Per Share					21.62
Forfeited, Weighted Average Grant-Date Fair Value Per Share					$ 21.80
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance of Outstanding Shares	1,712,204		757,871		556,140
Granted, Shares	289,392		1,555,828		808,898
Vested, Shares	(422,284)	[1]	(381,850)	[1]	(197,609)
Forfeited, Shares	(125,489)		(219,645)		(409,558)
Ending balance of Outstanding Shares	1,453,823		1,712,204		757,871
Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Share	$ 4.63		$ 5.55		$ 7.35
Granted, Weighted Average Grant-Date Fair Value Per Share	8.49		4.58		5.29
Vested, Weighted Average Grant-Date Fair Value Per Share	4.64	[1]	5.98	[1]	7.94
Forfeited, Weighted Average Grant-Date Fair Value Per Share	5.56		5.06		6.33
Ending balance of Outstanding, Weighted Average Grant-Date Fair Value Per Share	$ 5.32		$ 4.63		$ 5.55
[1] The total vested awards include 6.3 thousand and 9.2 thousand of vested restricted stock units settled in cash for the years ended December 31, 2017 and 2016, respectively. 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://www.xbrl.org/2003/role/presentationRef
-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=96867065&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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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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