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Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail)
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6 Months Ended | ||||||
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Jun. 30, 2014
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Jun. 30, 2014
9.125% Senior Notes, due April 2018 [Member]
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Dec. 31, 2013
9.125% Senior Notes, due April 2018 [Member]
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Jul. 30, 2013
9.125% Senior Notes, due April 2018 [Member]
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Jun. 30, 2014
7.50% Senior Notes, due August 2020 [Member]
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Dec. 31, 2013
7.50% Senior Notes, due August 2020 [Member]
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Jul. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
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| Supplemental Guarantor Financial Information [Line Items] | |||||||
| Percentage of notes guaranteed by restricted subsidiaries | 9.125% | 9.125% | 9.125% | 7.50% | 7.50% | 7.50% | |
| Percentage of guaranteed subsidiaries by the parent companies | 100.00% |