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Fair Value Measurements - Schedule of Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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Fair Value, Measurements, Recurring [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents | $ 1,826,658 | $ 1,377,330 |
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Fair Value, Measurements, Recurring [Member] | Quoted Market Prices in Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents | 1,826,658 | 1,377,330 |
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Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents | ||
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Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents | ||
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Interest Rate Caps [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Interest rate caps | 200 | 200 |
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Interest Rate Caps [Member] | Fair Value, Measurements, Recurring [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Interest rate caps | 242 | 218 |
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Interest Rate Caps [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Market Prices in Active Markets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Interest rate caps | ||
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Interest Rate Caps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Interest rate caps | 242 | 218 |
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Interest Rate Caps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Interest rate caps |