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Share based compensation arrangement by share based payment award discount on market price of common stock percentage.

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Share based payment award equity instruments other than options grants in period aggregate intrinsic value.

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Share based compensation arrangement by share based payment award maximum employee subscription value

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Share-based compensation arrangement by share-based payment award maximum percentage of earnings on employee base salaries.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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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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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Per share or per unit amount of equity securities issued.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock-Based Compensation - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Apr. 20, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 1,728,000	$ 1,445,000	$ 3,435,000	$ 2,969,000
Stock-based compensation, capitalized		85,000	112,000	244,000	243,000
Unrecognized compensation costs for all share-based payment arrangements		4,799,000		4,799,000
Accrued liabilities		42,384,000		42,384,000			$ 33,016,000
Other non-current liabilities		$ 6,242,000		$ 6,242,000			$ 13,619,000
Common stock, shares issued		78,593,002		78,593,002			74,436,579
Time-Based Stock Appreciation Rights [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 48,000	141,000	$ 108,000	295,000
Unrecognized compensation costs for all share-based payment arrangements		225,000		225,000
Intrinsic value of SARs		521,000		$ 521,000
Number of shares, granted				0
Performance-Based Stock Appreciation Rights [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				$ 0	0
Unrecognized compensation costs for all share-based payment arrangements		0		0
Intrinsic value of SARs		70,000		$ 70,000
Number of shares, granted				0
Time-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		1,055,000	679,000	$ 2,004,000	1,379,000
Unrecognized compensation costs for all share-based payment arrangements		3,376,000		$ 3,376,000
Number of shares, granted				61,176
Performance-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		364,000	302,000	$ 867,000	742,000
Unrecognized compensation costs for all share-based payment arrangements		1,247,000		1,247,000
Performance Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 181,000	250,000	$ 304,000	434,000
Maximum percentage of MPUs for senior executives		15.00%		15.00%
Fair value period of MPUs				3 years
Accrued liabilities		$ 478,000		$ 478,000			$ 895,000
Other non-current liabilities		$ 127,000		$ 127,000			$ 301,000
Market Performance Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of MPUs				3 years
Common stock, shares issued						81,277
2016 LTIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant		4,332,589		4,332,589
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 80,000	$ 73,000	$ 152,000	$ 119,000
Number of shares authorized under the plan	5,000,000
Maximum percentage deductible from employees' gross pay	10.00%
Maximum amount deductible from employees gross pay	$ 25,000
Purchases of common stock				81,525
Share price		$ 8.21		$ 8.21
ESPP [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum percentage of discount on common stock's fair market value	15.00%