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Summary of Option Activity (Parenthetical) (Detail) - $ / shares	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Price Per Share, Option exercised	$ 7.50	$ 7.50	$ 7.50
Weighted Average Price Per Share, Option forfeited	$ 11.49	$ 11.49	11.49
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Price Per Share, Option forfeited			11.49
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Price Per Share, Option forfeited			$ 13.24
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Price Per Share, Option forfeited				$ 11.49

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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