Defined Benefit Pension Plan and Postretirement Benefits - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2012
Defined Contribution Plan Disclosure [Line Items]
Percentage of employer's contribution based on participants contribution		50.00%
Percentage of employer's contribution based on participants compensation		2.00%
Alpine Access Inc [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of employer's contribution based on participants contribution for first included compensation		100.00%
Percentage of employer's contribution based on participants compensation for first included compensation		3.00%
Percentage of employer's contribution based on participants contribution for next included compensation		50.00%
Percentage of employer's contribution based on participants compensation for next included compensation		2.00%
Employees are vested in contributions		100.00%
Defined contribution plan cash contributions	$ 0.00	$ 0.00

Defined contribution plan cash contributions.

No definition available.

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Defined Contribution Plan Employer Matching Contribution Percent For First Included Compensation

No definition available.

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Defined Contribution Plan Employer Matching Contribution Percent For Next Included Compensation

No definition available.

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Defined Contribution Plan Maximum Employer Match Percentage For First Included Compensation

No definition available.

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Defined Contribution Plan Maximum Employer Match Percentage For Next Included Compensation

No definition available.

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Employee Contributions Vested Percentage

No definition available.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

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Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

No definition available.

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