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Stockholders' Equity - Summary of Estimated Earned Payout (Detail)	12 Months Ended
	Dec. 31, 2015
2015 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimated Payout on Adjusted EBITDA	100.00%
Estimated Payout on TSR	100.00%
Estimated Payout Combined	100.00%
2014 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimated Payout on Adjusted EBITDA	200.00%
Estimated Payout on TSR	200.00%
Estimated Payout Combined	200.00%
2013 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimated Payout on Adjusted EBITDA	200.00%
Estimated Payout on TSR	200.00%
Estimated Payout Combined	200.00%

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- Definition

Estimated payout percentage.

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- Definition

Estimated payout percentage adjusted EBITDA.

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- Definition

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- Definition

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