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Taxation - Summary of Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 39 $ 505 $ 664
Increases in positions taken in a prior period 0 0 0
Decreases in positions taken in a prior period 0 0 0
Increases in positions taken in a current period 65 39 117
Decreases in positions taken in a current period 0 0 0
Decreases due to settlements (39) (202) 0
Decreases due to lapse of statute of limitations 0 (303) (276)
Balance at end of period $ 65 $ 39 $ 505