Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Not included in cash and cash equivalent amount	$ 201,135
Non Negotiable Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Not included in cash and cash equivalent amount	$ 7,731