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Financial Assets and Liabilities Accounted For at Fair Value on Recurring Basis (Detail) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | $ 237,836 | $ 315,177
Other debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 653 | 1,106
Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 46,768 | 121,112
Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 188,540 | 190,311
Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 1,875 | 2,648
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 1 | Other debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 0 | 0
Fair Value, Inputs, Level 1 | Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 1 | Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 1 | Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 259,191 | 346,136
Fair Value, Inputs, Level 2 | Other debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 0 | 0
Fair Value, Inputs, Level 2 | Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 69,721 | 155,694
Fair Value, Inputs, Level 2 | Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 189,470 | 190,442
Fair Value, Inputs, Level 2 | Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 2,528 | 3,754
Fair Value, Inputs, Level 3 | Other debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and Capital Lease Obligations | 653 | 1,106
Fair Value, Inputs, Level 3 | Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 | Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 | Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 1,875 | $ 2,648

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